The 100 best challenging books about faith and spirituality

Divine Comedy by Dante Alighieri, Paradise Lost by John Milton and Thus Spake Zarathustra A book for all and none by Friedrich Nietzsche lead the 100 best challenging books about faith and spirituality, ranked by literary regard. To start, The Good Soldier by Ford Madox Ford is the most approachable of the highly regarded books here, about 7 hours to read.

Each point of light is one of the 100, placed by how hard it is to read. The brighter, the higher it ranks. The dotted line is one way up.

100
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Challenging31 booksDifficult68 booksVery Difficult1 book

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No. 1 of 100

Divine Comedy

Dante Alighieri · 1320

Difficulty 67/10011 hours

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Readable here · 13

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Showing 100 books

About 1,359 hours for 100 of 100 books with measured lengths. Estimates use 250 words a minute, adjusted for each book's difficulty. At 2 hours a day, about 680 days for those books.

1–10 · 154 hours
  1. No. 1 on this list. Divine Comedy

    Dante Alighieri · 1320

    Challenging11 hours

    Taught in schools: Armenian secondary literature, Lektury obowiązkowe – Polish national reading list (Poland), UNAM Escuela Nacional Preparatoria – programas de Literatura (Mexico)

    Included in: Bokklubben World Library, Great Books of the Western World, UNESCO Collection of Representative Works

    Dante built a complete architecture of the afterlife so precise you can map it, then populated it with real people he knew. The result fused theology, politics, and autobiography into a single narrative structure that no poem has matched in ambition or execution.

  2. No. 2 on this list. Paradise Lost

    John Milton · 1667

    Challenging8.4 hours

    Taught in schools: AQA GCSE and A-level English Literature (UK), WJEC/Eduqas GCSE and A-level English Literature (UK)

    Included in: Great Books of the Western World

    Milton retold the fall of man in blank verse of such muscular grandeur that Satan became the most charismatic figure in English poetry — not because Milton failed, but because he understood that rebellion requires eloquence. The poem reshaped the English language's sense of what a long sentence could do.

  3. A standard text in philosophy and German-literature courses, and one of the most widely read works of modern philosophy worldwide. Often the entry point to Nietzsche. It ranks with Notes from Underground in curricula, though less often assigned in full than Crime and Punishment.

  4. No. 4 on this list. A Portrait of the Artist as a Young Man

    James Joyce · 1916

    Difficult11 hours

    Included in: Great Books of the Western World

    Appears on 3,243 university syllabi according to the Open Syllabus Project (87.8th percentile), placing it in the company of the most-taught literary novels in English. Featured on the Modern Library 100 Best Novels, 1001 Books You Must Read Before You Die, and available in 40 Wikipedia languages — a global footprint that confirms its standing as a fixture of the Anglo-Irish modernist curriculum.

  5. Eliot fused the rhythms of Anglican liturgy, the imagery of the English countryside, and the philosophy of time into four linked meditations on what it means to arrive where you started and know the place for the first time. The poems represent the summit of his craft — the point where his erudition finally dissolved entirely into music.

  6. No. 6 on this list. Mahabharata

    Vyasa · c. 400 BCE

    Challenging61 hours

    At roughly 1.8 million words, the Mahabharata is the longest poem ever composed, and it earns its length: a dynastic war becomes the scaffold for a complete philosophy of duty, cosmic law, and the impossibility of righteous action in a fallen world. The Bhagavad Gita is embedded within it as a single episode, which gives some measure of its ambition.

  7. The Faerie Queene appears in virtually every English Renaissance literature syllabus globally and is one of the most taught long poems in university English departments worldwide. It anchors the canon between Chaucer and Milton and is central to every history of the English literary tradition. Absence from the Open Syllabus database reflects data gaps, not actual classroom presence.

  8. Peer Gynt is a cornerstone of the Scandinavian theatrical canon and is regularly staged worldwide, from the National Theatre to major European opera houses. Edvard Grieg's 1876 incidental music gave the work cultural reach extending far beyond theatre audiences. It appears on world drama syllabi internationally and is central to any survey of 19th-century European literature.

  9. No. 9 on this list. The Scarlet Letter

    Nathaniel Hawthorne · 1850

    Difficult9.4 hours

    Taught in schools: Common Core text exemplars (Appendix B) (US), CSEC English B – Caribbean Examinations Council

    Appears on 1,893 university syllabi (Open Syllabus, 81.9th percentile), a fixture of American literature courses and AP high school curricula across the United States. Wikipedia articles exist in 38 languages, and the work has continuous presence in American literary education since its 1850 publication.

  10. "A Simple Heart" is one of the most anthologized short stories in world literature and appears across university syllabi in French literature and world literature courses. The collection as a whole is standard reading in 19th-century realism curricula globally. No scraped syllabus data was returned, but the collection's presence in major anthologies and its continuous critical attention over 140 years place it firmly in the high-canonical range.

11–20 · 110 hours
  1. No. 11 on this list. Measure for Measure · William Shakespeare · 1604

    Taught in schools: AQA GCSE and A-level English Literature (UK), WJEC/Eduqas GCSE and A-level English Literature (UK)

    Included in: Great Books of the Western World

    Measure for Measure appears on university syllabi across English literature, drama, law, and gender studies courses worldwide. It is one of Shakespeare's most-taught 'problem plays,' central to any serious study of his canon, with Wikipedia articles in dozens of languages. Less ubiquitous than Hamlet or Macbeth, but firmly within the core Shakespeare curriculum.

    Difficult2.8 hours

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  2. No. 12 on this list. The Brothers Karamazov · Fyodor Dostoevsky · 1880

    Included in: Bokklubben World Library, Great Books of the Western World

    Dostoevsky staged the question of whether God's existence can be reconciled with the suffering of children as a family drama among four brothers, each embodying a different answer. The Grand Inquisitor chapter alone would secure its place; the rest of the novel makes it the most intellectually ambitious work of fiction ever completed.

    Challenging35 hours

    Read now
  3. No. 13 on this list. The Satanic Verses · Salman Rushdie · 1988

    The Satanic Verses occupies singular position in late-twentieth-century literature due to the fatwa issued by Ayatollah Khomeini, making it perhaps the most internationally controversial novel of its era. Beyond the political firestorm, it stands as landmark postcolonial fiction and exemplar of British multicultural literature. The novel appears on standard lists of essential postmodern works and remains central to discussions of migration, identity, and religion in global fiction. Its notoriety ensures permanent place in literary and political history.

    Difficult26 hours

    Start this book
  4. No. 14 on this list. Voss · Patrick White · 1957

    Voss is recognized as a cornerstone of Australian literature and a major work of postcolonial fiction. It consistently appears in scholarly discussions of antipodean identity, imperial mythology, and mid-century modernism. The novel has maintained critical attention since publication and is standard curriculum in Australian and Commonwealth literary studies.

    Challenging16 hours

    Start this book
  5. No. 15 on this list. Poem Without a Hero · Anna Akhmatova · 1960

    Requiem and Poem Without a Hero are canonical texts of 20th-century Russian literature and essential documents of Stalinist-era witness poetry — required reading in Russian literature courses worldwide. No database records appear for this English translation's syllabus presence, but the works are universally taught in courses on Soviet literature, women's writing, and poetry of witness. The Wikipedia absence in this database likely reflects a data gap rather than actual obscurity: Akhmatova's works are foundational to Russian studies curricula.

    Difficult2 hours

    Start this book
  6. No. 16 on this list. Angels in America: Perestroika · Tony Kushner · 1992

    Angels in America is taught in American theater, drama, and queer studies programs at universities across the country and is consistently listed among the essential works of 20th-century American literature. Both parts of the play appear regularly on syllabi in literature, political science, and history courses. Its status as a defining document of the AIDS crisis and Reagan-era America makes it required context for anyone studying the period.

    Difficult6.8 hours

    Start this book
  7. No. 17 on this list. Go Tell It on the Mountain · James Baldwin · 1953

    Listed on both the Modern Library 100 Best Novels (1998) and TIME All-TIME 100 Novels (2005), and appears on 414 university syllabi (65th percentile by Open Syllabus data). Baldwin's debut is a fixture in American literature and African-American literature courses.

    Difficult10 hours

    Start this book
  8. No. 18 on this list. The Good Soldier · Ford Madox Ford · 1915

    Appears on 473 university syllabi (67th percentile in Open Syllabus), placing it firmly in the modernist teaching canon alongside Conrad and early Lawrence. Listed on the Modern Library 100 Best Novels. A standard text in courses on British modernism and narrative technique, though less universally assigned than Woolf or Joyce.

    Challenging7 hours

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  9. No. 19 on this list. The Ones Who Walk Away from Omelas · Ursula K Le Guin · 1973

    Widely taught in philosophy, ethics, and literature courses globally. Anthologized in hundreds of collections and featured on virtually every 'essential short fiction' list. Its presence in academic syllabi rivals Borges and Kafka in ethics curricula, where it functions as a standard thought-experiment text.

    Challenging40 min

    Start this book
  10. No. 20 on this list. Billy Budd, Sailor · Herman Melville

    Taught in schools: Common Core text exemplars (Appendix B) (US)

    Billy Budd is a fixture in American literature courses, canonized alongside Moby-Dick as one of Melville's essential works and one of the foundational American novellas. Although the data signals show no tracked syllabus entries in this database, the text has been continuously taught at university level since its rediscovery in the 1920s and appears on virtually every American literature syllabus covering the 19th century. It is frequently included on lists of great American fiction.

    Difficult3.3 hours

    Read now
21–30 · 91 hours
  1. No. 21 on this list. Under Western Eyes · Joseph Conrad · 1911

    Under Western Eyes holds a secure place in the Conrad canon — studied in university courses alongside Nostromo, The Secret Agent, and Lord Jim, and consistently discussed in critical accounts of Conrad's major work. Leavis included Conrad among the great tradition of English novelists, and the novel's treatment of guilt, betrayal, and political despotism has kept it on syllabi across literature and political thought programmes. Its standing is below Heart of Darkness and Lord Jim in frequency of assignment but firmly canonical within the Conrad corpus.

    Difficult15 hours

    Start this book
  2. No. 22 on this list. The Golden Ass · Apuleius · 170

    Included in: Oxford World's Classics

    The Golden Ass is the only Latin prose novel to survive complete from antiquity, making it a required text in virtually every classical literature and ancient novel course worldwide. Though the database returned no formal syllabus entries, the work appears across comparative literature, mythology, and world literature curricula at universities globally. It features in most canonical 'great books' programs and was included in Harold Bloom's Western Canon.

    Difficult12 hours

    Start this book
  3. No. 23 on this list. The Axion Esti · Odysseas Elytis · 1959

    The Axion Esti stands as the central work of modern Greek poetry and one of the most significant long poems of the 20th century. It holds canonical status in Greek literature comparable to The Waste Land in English, widely taught in Greek schools and universities. The work's international recognition increased substantially after Elytis received the Nobel Prize in Literature (1979), though it remains less widely read outside Greece than other Nobel-honored poetry.

    Challenging38 min

    Start this book
  4. No. 24 on this list. The Vatican Cellars · André Gide · 1914

    The Vatican Cellars opens in Rome in 1890 with Anthime Armand-Dubois, a freemason rationalist whose body trembles with spasms while his wife Véronique maintains quiet devotion. Anthime conducts vivisection experiments on animals to reduce behavior to simple tropisms, recruiting street orphan Beppo to procure his living test subjects. When Anthime smashes a Madonna statue in fury at his wife's prayers, he experiences a dream-vision of the Blessed Virgin that leaves him physically healed yet spiritually transformed. The novel then shifts to Julius de Baraglioul, a novelist and aristocrat whose father sends him to investigate the mysterious young Lafcadio Wluiki, a mysterious nineteen-year-old orphan of dubious origins. Julius discovers Lafcadio's private notebook, where the youth records not moral reflections but acts of self-harm, punishing himself with meticulous tallies for imagined transgressions. Gide weaves together these character strands with satirical precision, creating a darkly comic examination of belief, rebellion, and the peculiar violence that lurks beneath bourgeois respectability.

    Challenging7.5 hours

    Start this book
  5. No. 25 on this list. Cymbeline · William Shakespeare · 1611

    Included in: Great Books of the Western World

    Cymbeline is a regular presence in university Shakespeare courses and appears in collected editions universally, but it occupies the second tier of the canon — studied more as a late romance alongside The Winter's Tale and The Tempest than as a standalone essential. It lacks the curricular centrality of Hamlet, Macbeth, or King Lear, and general readers are unlikely to encounter it outside academic contexts. Its place in the late-romances grouping grants it moderate canonical standing, above Pericles but well below the great tragedies.

    Difficult3.4 hours

    Read now
  6. No. 26 on this list. Fifth Business · Robertson Davies · 1970

    Fifth Business is widely regarded as the foundational text of modern Canadian literature and a fixture on university English syllabi across Canada and internationally. Its place at the head of the Deptford Trilogy and its sustained presence in academic course lists — from Canadian literature surveys to courses on the psychological novel — cement its canonical standing well beyond its national origin.

    Difficult13 hours

    Start this book
  7. No. 27 on this list. House of Glass · Pramoedya Ananta Toer · 1988

    House of Glass is the concluding volume of the Buru Quartet, which is universally regarded as the most important work of Indonesian literature and one of the defining anticolonial novels of the twentieth century. It appears on numerous world literature reading lists and is taught at universities across Southeast Asia, Europe, and North America, though its presence in Western canons is less robust than its literary standing merits.

    Difficult20 hours

    Start this book
  8. No. 28 on this list. The Winding Stair · William Butler Yeats · 1933

    Published in 1933, this collection represents Yeats at the height of his late powers, confronting old age, political disillusionment, and metaphysical yearning through symbols drawn from his occult system A Vision. The tower at Thoor Ballylee becomes a central image: in 'Blood and the Moon' it rises as both Anglo-Irish monument and emblem of consciousness ascending through gyres of history. 'A Dialogue of Self and Soul' stages an internal debate between transcendent renunciation and acceptance of embodied life, concluding with a forceful affirmation of existence that forgives even suffering. The paired Byzantium poems ('Sailing to Byzantium' appears in the earlier Tower volume, but 'Byzantium' here extends the meditation) envision sacred art as escape from biological decay into eternal form. 'Coole Park and Ballylee, 1931' elegizes Lady Gregory's estate and the cultural moment it represented, now dissolving in Ireland's post-revolutionary violence. 'Vacillation' sustains eight sections of philosophical oscillation between worldly and spiritual commitments without final resolution. Throughout, Yeats employs demanding stanzaic forms—ottava rima, terza rima—whose formal strictness contains explosive metaphysical content, creating poetry that is simultaneously architectural and visionary.

    Difficult53 min

    Start this book
  9. No. 29 on this list. Parable of the Talents · Octavia E. Butler · 1998

    Winner of the Nebula Award for Best Novel (1999). Widely taught in speculative fiction, Afrofuturism, and American dystopia courses. The Parable duology is among the most assigned works in contemporary SF syllabi and is firmly canonical within the genre; its canonical standing in broader American literary culture continues to grow.

    Challenging13 hours

    Start this book
  10. No. 30 on this list. Rameau's Nephew · Denis Diderot · 1805

    Included in: Great Books of the Western World

    Rameau's Nephew is a fixture in 18th-century French literature and philosophy courses at the university level, though it occupies a more specialist niche than Diderot's Encyclopédie work. It appears on syllabi in French literature, Enlightenment studies, and courses on the dialogue form. Goethe's German translation (1805) was the work's first publication and secured its European reputation; Wikipedia articles exist in around 30 languages.

    Difficult6 hours

    Start this book
31–40 · 154 hours
  1. No. 31 on this list. Love Medicine

    Louise Erdrich · 1984

  2. No. 32 on this list. Our Lady of the Flowers

    Jean Genet · 1943

  3. No. 33 on this list. The Father

    August Strindberg · 1887

  4. No. 34 on this list. Terra Nostra

    Carlos Fuentes · 1975

  5. No. 35 on this list. The Vivisector

    Patrick White · 1970

  6. No. 36 on this list. Dog Years

    Günter Grass · 1963

  7. No. 37 on this list. The Ghost Writer

    Philip Roth · 1979

  8. No. 38 on this list. By Night in Chile

    Roberto Bolaño · 2000

  9. No. 39 on this list. The End of the Affair

    Graham Greene · 1951

  10. No. 40 on this list. A Number

    Caryl Churchill · 2002

41–50 · 144 hours
  1. No. 41 on this list. A Tale of a Tub

    Jonathan Swift · 1704

  2. No. 42 on this list. Stories of Your Life and Others

    Ted Chiang · 2002

  3. No. 43 on this list. A Fable

    William Faulkner · 1955

  4. No. 44 on this list. The Tunnel

    William Gass · 1995

  5. No. 45 on this list. Human Acts

    Han Kang · 2014

  6. No. 46 on this list. Ninety-Three

    Victor Hugo · 1874

  7. No. 47 on this list. Oranges Are Not the Only Fruit

    Jeanette Winterson · 1985

    Taught in schools: AQA GCSE and A-level English Literature (UK), WJEC/Eduqas GCSE and A-level English Literature (UK)

  8. No. 48 on this list. Jack

    Marilynne Robinson · 2020

  9. No. 49 on this list. Brighton Rock

    Graham Greene · 1938

    Taught in schools: AQA GCSE and A-level English Literature (UK)

  10. No. 50 on this list. Frog

    Mo Yan · 2009

51–60 · 161 hours
  1. No. 51 on this list. The Book of the New Sun

    Gene Wolfe · 1980

  2. No. 52 on this list. Miss Lonelyhearts

    Nathanael West · 1933

  3. No. 53 on this list. Baudolino

    Umberto Eco · 2000

  4. No. 54 on this list. The Girls of Slender Means

    Muriel Spark · 1963

  5. No. 55 on this list. Just Above My Head

    James Baldwin · 1979

  6. No. 56 on this list. Stranger in a Strange Land

    Robert A. Heinlein · 1961

  7. No. 57 on this list. A Guest for the Night

    Shmuel Yosef Agnon · 1939

  8. No. 58 on this list. The Spire

    William Golding · 1964

  9. No. 59 on this list. Baron Wenckheim's Homecoming

    László Krasznahorkai · 2016

  10. No. 60 on this list. Omensetter's Luck

    William Gass · 1966

61–70 · 134 hours
  1. No. 61 on this list. The Demolished Man

    Alfred Bester · 1953

  2. No. 62 on this list. An Artist of the Floating World

    Kazuo Ishiguro · 1986

  3. No. 63 on this list. The Crime of Father Amaro

    José Maria de Eça de Queirós · 1875

  4. No. 64 on this list. Under the Volcano

    Malcolm Lowry · 1947

  5. No. 65 on this list. Riders in the Chariot

    Patrick White · 1961

  6. No. 66 on this list. The Eternal Husband

    Fyodor Dostoevsky · 1870

  7. No. 67 on this list. The Tenant of Wildfell Hall

    Anne Brontë · 1848

    Taught in schools: AQA GCSE and A-level English Literature (UK), Leaving Certificate English – NCCA / State Examinations Commission (Ireland)

  8. No. 68 on this list. Septology

    Jon Fosse · 2019

  9. No. 69 on this list. The Victim

    Saul Bellow · 1947

  10. No. 70 on this list. A Canticle for Leibowitz

    Walter M. Miller Jr. · 1960

71–80 · 145 hours
  1. No. 71 on this list. World Light

    Halldór Laxness · 1937

    Included in: UNESCO Collection of Representative Works

  2. No. 72 on this list. Oscar and Lucinda

    Peter Carey · 1988

  3. No. 73 on this list. Pastoralia

    George Saunders · 2000

  4. No. 74 on this list. The Kindly Ones

    Jonathan Littell · 2006

  5. No. 75 on this list. Niels Lyhne

    Jens Peter Jacobsen · 1880

  6. No. 76 on this list. The Enchanted Wanderer

    Nikolai Leskov · 1873

    Taught in schools: Russian FGOS literature standard

  7. No. 77 on this list. The Confidence-Man

    Herman Melville · 1857

  8. No. 78 on this list. The Dew Breaker

    Edwidge Danticat · 2004

  9. No. 79 on this list. The Sirens of Titan

    Kurt Vonnegut · 1959

  10. No. 80 on this list. Waterland

    Graham Swift · 1983

    Taught in schools: AQA GCSE and A-level English Literature (UK)

81–90 · 101 hours
  1. No. 81 on this list. Mr Loverman

    Bernardine Evaristo · 2013

  2. No. 82 on this list. A Question of Power

    Bessie Head · 1974

  3. No. 83 on this list. Carpentaria

    Alexis Wright · 2006

  4. No. 84 on this list. Exit West

    Mohsin Hamid · 2017

  5. No. 85 on this list. The House on the Hill

    Cesare Pavese · 1948

  6. No. 86 on this list. The Honorary Consul

    Graham Greene · 1973

  7. No. 87 on this list. Time's Arrow

    Martin Amis · 1991

  8. No. 88 on this list. Strangers on a Train

    Patricia Highsmith · 1950

  9. No. 89 on this list. Gateway

    Frederik Pohl · 1977

  10. No. 90 on this list. The Bone People

    Keri Hulme · 1985

91–100 · 165 hours
  1. No. 91 on this list. The Wild Iris

    Louise Glück · 1992

  2. No. 92 on this list. The Towers of Trebizond

    Rose Macaulay · 1956

  3. No. 93 on this list. Requiem for a Nun

    William Faulkner · 1951

  4. No. 94 on this list. Nights of Plague

    Orhan Pamuk · 2021

  5. No. 95 on this list. The Books of Jacob

    Olga Tokarczuk · 2014

  6. No. 96 on this list. Jerusalem

    Selma Lagerlöf · 1901

  7. No. 97 on this list. Pierre

    Herman Melville · 1852

  8. No. 98 on this list. We Need to Talk About Kevin

    Lionel Shriver · 2005

  9. No. 99 on this list. House of Day, House of Night

    Olga Tokarczuk · 1998

  10. No. 100 on this list. The Poisonwood Bible

    Barbara Kingsolver · 1999

About this list

These 100 books are the highest-scoring eligible challenging books about faith and spirituality currently in the catalogue. About 1,359 hours of reading in all. Difficulty runs from 69 to 74 out of 100 for the middle half of the list; the summit is The Tunnel at 85.

This list is ranked by literary regard, with a consistent order for equal scores. Membership follows authors and co-authors, not translators or editors. A book is here when ReadingRate files it under Faith & Spirituality as one of its primary reading domains, at a confidence of 0.8 or more. Catalogue coverage and the historical canon both limit what this list can represent.

When we matched the Canons dataset to our catalogue in October 2026, our canonical-status scores rose with the number of school curricula, publisher series and lists in it that cite a work: the median score was 72 for books one such source cites, 84 at two, 88 at three, 92 at four and 93 at five or more. Prizes are left out of that count. Outside the state curricula, the dataset’s sources choose mostly from what has been translated into English or French, so it is a weaker check on other literatures. Source: Canons (Andrew Piper), CC BY 4.0

Questions people actually ask

What are the best challenging books about faith and spirituality?
By literary regard, which weighs canonical status, critical standing and influence: Divine Comedy by Dante Alighieri, Paradise Lost by John Milton, Thus Spake Zarathustra A book for all and none by Friedrich Nietzsche, A Portrait of the Artist as a Young Man by James Joyce and Four Quartets by T. S. Eliot. ReadingRate ranks 100 such books, each with a difficulty score and a reading-time estimate.
Which challenging books about faith and spirituality should I read first?
Start from difficulty, not from rank. The most approachable books on this list that still carry top literary regard are The Good Soldier by Ford Madox Ford (about 7 hours), The Ones Who Walk Away from Omelas by Ursula K Le Guin and Peer Gynt by Henrik Ibsen.
What are the shortest of the best challenging books about faith and spirituality?
Among the top 25, the shortest are The Axion Esti by Odysseas Elytis (about 38 min), The Ones Who Walk Away from Omelas by Ursula K Le Guin (about 40 min) and Four Quartets by T. S. Eliot (about 51 min), at an average pace of 250 words a minute adjusted for each book's difficulty.
Which of the best challenging books about faith and spirituality are the established classics?
By canonical status, how firmly a book sits in curricula, anthologies and the canon: Divine Comedy by Dante Alighieri, Mahabharata by Vyasa, Paradise Lost by John Milton, The Brothers Karamazov by Fyodor Dostoevsky and Four Quartets by T. S. Eliot.
Can I read any of these challenging books about faith and spirituality for free?
13 of the 100 open in ReadingRate's reader with a free account, from public-domain editions: Divine Comedy, Paradise Lost, A Portrait of the Artist as a Young Man, Mahabharata, The Scarlet Letter and 8 more.
How long would it take to read the top ten?
About 154 hours, at an average pace of 250 words a minute adjusted for each book's difficulty: 77 days at two hours a day. Set your own pace on the page and the list's reading times change to it.
How hard are challenging books about faith and spirituality to read?
Most of this list sits between 69 and 74 on ReadingRate's 100-point difficulty scale, where 40 to 55 is moderate. The summit is The Tunnel at 85. Every entry carries its own score, so a reader can pick a great book at a difficulty they will finish.
How is this list ranked?
On literary-regard data: how canonically established a work is, its critical standing, and its influence on later writing. It is not a readers’ poll, which is why recent bestsellers rarely appear. Membership follows authors and co-authors, not translators or editors. Lists by country, author, period, theme or difficulty keep to literature (fiction, poetry, drama and philosophy), their novels, poems and plays first and their philosophy after them; a list of a kind of book, such as memoir or criticism, keeps every book of that kind. Every list holds at most three works by one author. A book is here when ReadingRate files it under Faith & Spirituality as one of its primary reading domains, at a confidence of 0.8 or more.