“… Gentlemen don't understand anything, however wise they may be.”
Source: Venetia
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Georgette Heyer 39
British historical romance and detective fiction novelist 1902–1974Related quotes
“Wise men don't judge: they seek to understand.”
Fingers Pointing Towards The Moon (1958)

“Anything you don't understand is dangerous until you do understand it.”
"Flatlander" (1967), first published in If (March 1967)

“What you don't understand you can make mean anything.”
Variant: What we don't understand we can make mean anything.
Source: Diary

On Euler's identity, <math>e^{i \pi} + 1 = 0. \,\!</math> as quoted in notes by W. E. Byerly, published in Benjamin Peirce, 1809-1880 : Biographical Sketch and Bibliography (1925) by R. C. Archibald; also in Mathematics and the Imagination (1940) by Edward Kasner and James Newman.

“You don't understand anything until you learn it more than one way.”
In Managing an Information Security and Privacy Awareness and Training Program (2005) by Rebecca Herold, p. 101

Source: Culture and Value (1980), p. 51e

“When a wise man does not understand, he says: "I do not understand."”
The fool and the uncultured are ashamed of their ignorance. They remain silent when a question could bring them wisdom.
The Godmakers (1972)