“Doctor, you don't know what it is to doubt everything, even yourself. No, you don't; you couldn't with eyebrows like yours.”
Source: Dracula
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Bram Stoker 84
Irish novelist and short story writer, best known today for… 1847–1912Related quotes

“Why you gotta act like you know, if you don't know?
It's okay if you don't know everything.”
"Bastard", "Songs for Silverman" (2005).
Song lyrics, Solo
Source: This is All: The Pillow Book of Cordelia Kenn

“If you don't know everything, you must go on with what you do know.”
Rand al'Thor
Source: A Crown of Swords (15 May 1996)

Source: age 12 http://www.vanityfair.com/magazine/2015/07/donald-ivana-trump-divorce-prenup-marie-brenner

Earliest attribution found in Who Said That?: More than 2,500 Usable Quotes and Illustrations https://books.google.nl/books?id=7mn8AwAAQBAJ&pg=PT63 (1995) by George Sweeting. Online sources always attribute the quote to Augustine, but never specify in which of his works it is to be found.
Disputed

Other

“You don't like the girl. You don't know what color eyes she has, you don't like her.”
Source: City of Thieves