“I believe in evil. It is the property of all those who are certain of truth.”
As quoted in The Martians of Science : Five Physicists Who Changed the Twentieth Century (2006) by István Hargittai, p. 251
Context: I believe in evil. It is the property of all those who are certain of truth. Despair and fanaticism are only differing manifestations of evil.
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Edward Teller 32
Hungarian-American nuclear physicist 1908–2003Related quotes
“I believe that ignorance is the root of all evil.
And that no one knows the truth.”

“Believe those who seek the truth, doubt those who find it; doubt all, but do not doubt yourself.”
Ainsi soit-il; ou, Les Jeux sont faits
So be it; or, The chips are down
Gallimard
1952
174
Original: (fr) Croyez ceux qui cherchent la vérité, doutez de ceux qui la trouvent; doutez de tout, mais ne doutez pas de vous-même.

2011, Tucson Memorial Address (January 2011)

Source: Violence and the Labor Movement (1914), p.xii

Don, in The Philanthropist (1969), scene 6

Source: (1776), Book V, Chapter I, Part II, 775.

“Poison cures in certain contingencies, and in those cases poison is not an evil thing.”
Le venin guerit en quelque rencontre, et, ce cas-là, le venin n'est pas mauvais.
Aristippe, ou De la cour (1658), Discours VI.
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 139.

The trial of Charles B. Reynolds for blasphemy (1887)