“Intelligent men are cruel. Stupid men are monstrously cruel.”
The Star Rover
Variant: Intelligent men are cruel. Stupid men are monstrously cruel
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Jack London 77
American author, journalist, and social activist 1876–1916Related quotes

“Weak men are apt to be cruel.”
http://books.google.com/books?id=K6lsEtMo1KMC&q=%22Weak+men+are+apt+to+be+cruel%22&pg=PA128#v=onepage
Political, Moral, and Miscellaneous Reflections (1750), Moral Thoughts and Reflections

“It is the certainty that they possess the truth that makes men cruel.”

In London Calling http://books.google.pt/books?id=l80fAQAAMAAJ&q=%22Men+tend+to+have+the+beliefs+that+suit+their+passions.%22&dq=%22Men+tend+to+have+the+beliefs+that+suit+their+passions.%22&hl=pt-PT&sa=X&ei=q9mEUcj-AoqM7AbW3IGoBQ&ved=0CFMQ6AEwBw (1947), p. 18
1940s

“Men are always the same. Fear makes them cruel.”
Source: The Moon and Sixpence (1919), Ch. 55, p. 204

“You are like all cruel men, sentimental; you are like all sentimental men; squeamish.”
“Poor Little Warrior!” p. 80
Short fiction, Who Can Replace a Man? (1965)

“What mean and cruel things men can do for the love of God.”
"1901", p. 67
A Writer's Notebook (1946)

“The Turk is cruel, but he is perfectly stupid, and is no match for the sagacious Albanian.”
New York Times (September 12th, 1912) http://www.thealbanians.com/historical_press/issa_boletini.htm.

Lecture II, section 35.
The Eagle's Nest (1872)
Context: We shall be remembered in history as the most cruel, and therefore the most unwise, generation of men that ever yet troubled the earth: — the most cruel in proportion to their sensibility, — the most unwise in proportion to their science. No people, understanding pain, ever inflicted so much: no people, understanding facts, ever acted on them so little.

“My father was a deeply sentimental man. And like all sentimental men, he was also very cruel.”