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Susan Cain reads to honor the inner life. Long before Quiet made her the public voice of introversion, she was the kind of introverted child for whom the library was a sanctuary and books were a private world you could disappear into — a young reader who kept the fantasy shelf close, from Betty Brock’s No Flying in the House to Edward Eager and E. Nesbit. That early inwardness — reading as a way of being alone and fully alive at the same time — became the through-line of everything she later wrote.
Her reading has two distinct registers, and this page keeps them separate. One is research: while writing Quiet she read deeply in the science of temperament — Jerome Kagan’s work on high-reactive infants, Elaine Aron’s research on sensitivity — books that shaped her thinking without being books she simply recommends. The other, more personal register is the one that opens up in Bittersweet: a turn from psychology toward poetry, longing, and beauty. Here she keeps Rumi’s “Love Dogs” inches from her desk, tapes C.S. Lewis’s writing on Sehnsucht — the “inconsolable longing” of The Weight of Glory — around her workspace, and calls Leonard Cohen a kind of patron saint. Alongside those formative loves are the books she has read for pleasure and pressed on others — Sam Harris’s Waking Up, which she found “completely lifechanging,” and Anne Lamott’s Bird by Bird — and the books she has publicly championed with a blurb. For Susan Cain, reading is not a toolkit for self-improvement; it is a way of giving the inner life a language.
Read together, Susan Cain’s books trace a single quiet argument: that the inner life deserves to be taken seriously, and that literature — more than any self-help formula — is how we learn to do it. Her reading is a sanctuary, not a system. That is what makes it so different from the productivity-and-decision reading lists of many public thinkers: there is no operating system here, no optimization. There is a child who found refuge in fantasy novels, an adult who reads to feel more, not to do more.
The arc runs in two movements. The first is Quiet: a research phase in which Cain read the psychology of temperament — Jerome Kagan on high reactivity, Elaine Aron on sensitivity — to build the case for introversion. It is important to be precise about this reading. These were influences on her work, not personal recommendations; Aron, in fact, blurbed Quiet, not the reverse. The second movement is Bittersweet, and it is the more revealing one as a portrait of Cain the reader. Here she moves from the science of the quiet temperament to the experience of longing and sorrow — and her sources become poets and mystics. Rumi sits at the center: she keeps the “Love Dogs” passage — “This longing you express is the return message” — physically close while she writes. C.S. Lewis’s The Weight of Glory, with its account of Sehnsucht, gives the book its intellectual spine, and Leonard Cohen — a musician, not an author, and so never a book recommendation — supplies its emotional key.
Set against those formative literary loves are her more everyday enthusiasms and her public endorsements, and the difference matters. The books she loved out loud — Harris’s Waking Up, which opened meditation to a self-described skeptic, and Lamott’s Bird by Bird, a companion for anyone who makes things — sit close to her own creative life. The books she has championed in print — Olga Khazan’s Weird, David Epstein’s Range, Mitch Prinstein’s Popular, Haemin Sunim’s Love for Imperfect Things — are honest endorsements, several of them circling her lifelong subjects of difference, belonging, and the emotional life, but they are books she praised, not books she has claimed as favorites. What unites the whole is a sensibility rather than a method: sorrow and beauty, the bittersweet, treated not as problems to solve but as sources of connection and creativity.
A childhood spent on the fantasy shelf becomes a lifelong attention to inwardness — the ground her work on introversion grows from. (Editorial synthesis.)
That attention meets the science of temperament: Jerome Kagan’s and Elaine Aron’s research shape Quiet. (Directly evidenced as influence — not books she recommends.)
From psychology to poetry: the turn toward longing and beauty that becomes Bittersweet, anchored by Rumi’s “Love Dogs,” which she keeps at her desk. (Directly evidenced.)
Lewis’s writing on Sehnsucht gives Bittersweet its spine and Leonard Cohen its emotional key — poetry and music as the language of feeling. (Directly evidenced; narrative influences, not cards.)
Rumi’s poetry — especially “Love Dogs,” whose lines she keeps at her desk as she writes — is her clearest literary favorite and a wellspring of Bittersweet. This standard English collection contains that poem; it represents her documented Rumi reading at the title level rather than a specific edition she named.
“This is the part I have inches away from me every day when I work.”PodcastSource: Susan Cain on Rumi — The Tim Ferriss Show #583 (Bittersweet)
The book she says she has given out more than any other — Sam Harris opening meditation to a self-described skeptic. A strong, first-person personal recommendation.
“It’s such a fantastic book. And it was really, for me, completely lifechanging…”PodcastSource: Susan Cain on Waking Up — The Tim Ferriss Show #357
A loved book about writing and the creative life — a natural companion for anyone who makes things, and a window onto Cain’s own relationship to craft.
“Oh, I love that book. Such a good book.”PodcastSource: Susan Cain on Bird by Bird — The Tim Ferriss Show #357
Susan Cain publicly championed this book — the endorsement closest to her own territory of difference, belonging, and the strength of being an outsider. A public endorsement, not a stated personal favorite.
“With Weird, she weaves together fascinating profiles and research with her own experience to reveal the secret strength of being different.”WebsiteSource: Susan Cain — endorsement blurb for Weird
Susan Cain endorsed this case for breadth and generalist thinking over narrow specialization. A public endorsement — on-theme with her interest in unconventional paths, but praised in print rather than named a personal favorite.
“It’s a joy to spend hours in the company of a writer as gifted as David Epstein.”WebsiteSource: Susan Cain — endorsement blurb for Range
Susan Cain praised this study of status, likability, and belonging — the psychology of popularity. A public endorsement in her longstanding subject area, offered as a blurb rather than a personal reading staple.
“Fascinating, well-researched, and accessible, Popular will make you rethink every social interaction you’ve had since high school, and help you find greater success and happiness.”WebsiteSource: Susan Cain — endorsement blurb for Popular
Susan Cain endorsed this book on self-compassion and imperfection — of her public endorsements, the closest in spirit to the inner-life register of Bittersweet. A public endorsement rather than a stated favorite.
“In Love for Imperfect Things, Haemin Sunim shows us how to cultivate all three, and to find beauty in the most imperfect of things—including your very own self.”WebsiteSource: Susan Cain — endorsement blurb for Love for Imperfect Things
The books she has spoken about most warmly in her own words are Rumi’s poetry (especially “Love Dogs,” which she keeps at her desk), Sam Harris’s Waking Up, which she called “completely lifechanging,” and Anne Lamott’s Bird by Bird. Her list of stated personal favorites is deliberately small; she has also publicly endorsed a number of other books, which is not the same as naming them favorites.
Bittersweet grows out of poetry and longing. Rumi is at its center — Cain keeps the “Love Dogs” passage close while she writes. C.S. Lewis’s The Weight of Glory, with its idea of Sehnsucht or “inconsolable longing,” gives the book its intellectual spine, and Leonard Cohen — a musician rather than an author — is its emotional key.
While writing Quiet, Susan Cain drew on the science of temperament — Jerome Kagan’s research on high-reactive children and Elaine Aron’s work on sensitivity. These shaped her research and thinking; they are influences on Quiet rather than books she personally recommends (Aron, in fact, blurbed Quiet).
By her own account she was an introverted, bookish child for whom the library was a sanctuary. She has spoken about loving fantasy novels — books in the vein of Betty Brock’s No Flying in the House, Edward Eager, and E. Nesbit — reading that fed the inwardness at the heart of her later work.
Her own work draws on introversion and temperament research, but her strongest documented personal recommendations are broader than an introversion reading list — poetry, meditation, and writing. She points to the research behind Quiet as influence rather than offering a simple list of introversion books to read.