“What know I?”
or What do I know?
Que sais-je?
The notion of skepticism is most clearly understood by asking this question.
Book II, Ch. 12
Essais (1595), Book II
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Michel De Montaigne 264
(1533-1592) French-Occitan author, humanistic philosopher, … 1533–1592Related quotes

"Doing What I Know" (song)
Song lyrics
Source: Gilbert O'Sullivan, "Doing What I Know" https://www.youtube.com/watch?v=YlkC9AFrSNU (song on YouTube)
“I hold up what I know with what I do not know.”
Lo que sé lo soporto con lo que no sé.
Voces (1943)

“I don't know what I feel or what I want to feel. I don't know what to think or what I am.”
Source: The Book of Disquiet

“I don't know what I want, but I know what I don't want”

“I'm not aware of too many things.
I know what I know if you know what I mean.”
"What I Am"
Shooting Rubberbands at the Stars (1988)

“I do not always know what I want, but I do know what I don't want.”

Discussing his high school years. Quoted in Michaud, Stephen; Aynesworth, Hugh (1999) The Only Living Witness: The True Story of Serial Sex Killer Ted Bundy (Paperback; revised ed.). Irving, Texas: Authorlink Press. pg. 66