“It's not just the books under fire now that worry me. It is the books that will never be written.”

From Why You Should Never be a Christian (1987) by Ishaq 'Kunle Sanni and ‎Dawood Ayodele Amoo.
Misattributed

Source: The Bed of Procrustes: Philosophical and Practical Aphorisms

Variant: There is no such thing as a moral or an immoral book. Books are well written, or badly written. That is all.
Source: The Picture of Dorian Gray

Orthodox Prayer Life: The Interior Way

As quoted in "My interview with R.A. Lafferty", by Tom Jackson, originally published in Lan's Lantern #39 (1991); here in the Sandusky Register (16 January 2015) http://www.sanduskyregister.com/story/201501160010

Letter to Nathaniel Hawthorne (July 1851); published in Memories of Hawthorne (1897) by Rose Hawthorne Lathrop, p. 157
Context: In me divine magnanimities are spontaneous and instantaneous — catch them while you can. The world goes round, and the other side comes up. So now I can't write what I felt. But I felt pantheistic then—your heart beat in my ribs and mine in yours, and both in God's. A sense of unspeakable security is in me this moment, on account of your having understood the book. I have written a wicked book, and feel spotless as the lamb. Ineffable socialities are in me. I would sit down and dine with you and all the Gods in old Rome's Pantheon. It is a strange feeling — no hopelessness is in it, no despair. Content — that is it; and irresponsibility; but without licentious inclination. I speak now of my profoundest sense of being, not of an incidental feeling.

A Few Maxims for the Instruction of the Over-Educated (1894)