“The Gods do not protect fools. Fools are protected by more capable fools.”
Source: Ringworld (1970), p. 96
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Larry Niven 138
American writer 1938Related quotes

“These are fools that men adore; both their Gods & their men are fools.”
I:11.
The Book of the Law (1904)

“Any fool can criticize, condemn, and complain — and most fools do.”
Attributed in various post-2000 works, but actually Dale Carnegie in How to Win Friends and Influence People p.14 http://books.google.com/books?id=yxfJDVXClucC&pg=PA14&dq=fool, published in 1936. (N.B. Carnegie is quoting Franklin immediately prior to writing this, so attribution could be due to a printing error in some edition).
Misattributed

Life of Marcus Cato
Bartlett's Familiar Quotations, 10th ed. (1919)

“Wise men learn more from fools than fools from the wise.”
Plutarch's Life of Cato
Variant: Wise men profit more from fools than fools from wise men; for the wise men shun the mistakes of fools, but fools do not imitate the successes of the wise.

“Tell me then, does love make one a fool or do only fools fall in love?”
Source: My Name is Red