One of the peculiar sins of the twentieth century which we've developed to a very high level is the sin of credulity. It has been said that when human beings stop believing in God they believe in nothing. The truth is much worse: they believe in anything.
(Malcolm Muggeridge (1903-1990), British broadcaster. "Woman's Hour," radio broadcast, March 23, 1966. Quoted in "An Eighth Deadly Sin," Muggeridge through the Microphone (1967).)
I believe in the brotherhood of man, all men, but I don't believe in brotherhood with anybody who doesn't want brotherhood with me. I believe in treating people right, but I'm not going to waste my time trying to treat somebody right who doesn't know how to return the treatment.
(Malcolm X (1925-1965), U.S. African-American leader, activist. speech, Dec. 12, 1964, New York City.)
If you set to work to believe everything, you will tire out the believing-muscles of your mind, and then you'll be so weak you won't be able to believe the simplest true things.
(Lewis Carroll [Charles Lutwidge Dodgson] (1832-1898), British author, mathematician, clergyman. Letter, May 23, 1864, to Mary MacDonald, daughter of the poet-novelist George MacDonald. The Letters of Lewis Carroll, vol. I, ed. Morton N. Cohen, Oxford University Press (1979).)