“I hate doubt, yet I am certain that doubt is the only way to approach anything worth believing in.”

As reported in a New York Times appraisal of his life http://www.nytimes.com/2018/06/08/dining/anthony-bourdain-restaurants.html

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 23.

Source: Anna Karenina Notes

Jokes and their Relation to the Cognitive Unconscious (1980)
Context: I am inclined to doubt that anything very resembling formal logic could be a good model for human reasoning. In particular, I doubt that any logic that prohibits self-reference can be adequate for psychology: no mind can have enough power — without the power to think about Thinking itself. Without Self-Reference it would seem immeasurably harder to achieve Self-Consciousness — which, so far as I can see, requires at least some capacity to reflect on what it does. If Russell shattered our hopes for making a completely reliable version of commonsense reasoning, still we can try to find the islands of "local consistency," in which naive reasoning remains correct.

Source: The Rum Diary

The Gospel in a Pluralist Society. Eerdmans, 1989 (reprinted 2002),19.

Variant: Dubito, ergo cogito, ergo sum.

(English: "I doubt, therefore I think, therefore I am")

"So what do you believe in?"