“Who once believed will never wholly doubt.”

Scene V, A Country Town; comparable to Alfred, Lord Tennyson "There lives more faith in honest doubt / Believe me, than in half the creeds."
Festus (1839)

Ainsi soit-il; ou, Les Jeux sont faits
So be it; or, The chips are down
Gallimard
1952
174
Original: (fr) Croyez ceux qui cherchent la vérité, doutez de ceux qui la trouvent; doutez de tout, mais ne doutez pas de vous-même.

Source: Of Love and Other Demons

Five Essays on Liberty (2002), Introduction (1969)
Context: Those, no doubt, are in some way fortunate who have brought themselves, or have been brought by others, to obey some ultimate principle before the bar of which all problems can be brought. Single-minded monists, ruthless fanatics, men possessed by an all-embracing coherent vision do not know the doubts and agonies of those who cannot wholly blind themselves to reality.

Lectures XIV and XV, "The Value of Saintliness"
Source: 1900s, The Varieties of Religious Experience (1902)
Context: I am well aware of how anarchic much of what I say may sound. Expressing myself thus abstractly and briefly, I may seem to despair of the very notion of truth. But I beseech you to reserve your judgment until we see it applied to the details which lie before us. I do indeed disbelieve that we or any other mortal men can attain on a given day to absolutely incorrigible and unimprovable truth about such matters of fact as those with which religions deal. But I reject this dogmatic ideal not out of a perverse delight in intellectual instability. I am no lover of disorder and doubt as such. Rather do I fear to lose truth by this pretension to possess it already wholly.

Source: The Princess and the Goblin

Scientology's 'heretic': How Marty Rathbun became the arch-enemy of L Ron Hubbard devotees, April 7, 2012, Guy Adams, The Independent, London, England http://www.independent.co.uk/news/people/profiles/scientologys-heretic-how-marty-rathbun-became-the-archenemy-of-l-ron-hubbard-devotees-7618944.html,

Source: 1800s, Auguries of Innocence (1803), Line 107

Source: Postscript to the Outsider (1967), p. 3