“The validity of usefulness, adequacy of popular standards can be tested only by research that violates them.”
pg 35.
Science in a Free Society (1978)
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Paul Karl Feyerabend 81
Austrian-born philosopher of science 1924–1994Related quotes
As quoted in The Journal of Imaging Science and Technology, Vol. 37, No. 3 (1992), p. 537
Context: There's a tremendous popular fallacy which holds that significant research can be carried out by trying things. Actually it is easy to show that in general no significant problem can be solved empirically, except for accidents so rare as to be statistically unimportant. One of my jests is to say that we work empirically — we use bull's eye empiricism. We try everything, but we try the right thing first!

Source: "Letter from a Region of My Mind" in The New Yorker (17 November 1962); republished as "Down at the Cross: Letter from a Region in My Mind" in The Fire Next Time (1963)
Context: If the concept of God has any validity or any use, it can only be to make us larger, freer, and more loving. If God cannot do this, then it is time we got rid of Him.

Barrack Obama National Education Association Speech, 2007
2007
Source: The social psychology of groups. 1959, p. 21

The Spiral Staircase: My Climb Out of Darkness (2004)
Context: The one and only test of a valid religious idea, doctrinal statement, spiritual experience, or devotional practice was that it must lead directly to practical compassion. If your understanding of the divine made you kinder, more empathetic, and impelled you to express this sympathy in concrete acts of loving-kindness, this was good theology. But if your notion of God made you unkind, belligerent, cruel, or self-righteous, or if it led you to kill in God's name, it was bad theology. Compassion was the litmus test for the prophets of Israel, for the rabbis of the Talmud, for Jesus, for Paul, and for Muhammad, not to mention Confucius, Lao-tsu, the Buddha, or the sages of the Upanishads.

News conference following the 25th OSCE Ministerial Council, Milan, Italy (7 December 2018)
Source: Mind and Nature, a necessary unity, 1988, p. 29
Chris Argyris (2004) in: " Surfacing Your Underground Organization http://hbswk.hbs.edu/archive/4456.html" on hbswk.hbs.edu by Mallory Stark, 11/1/2004
Cited in: Roberto Poli, Michael Healy, Achilles Kameas (2010) Theory and Applications of Ontology: Computer Applications . p. 533
Knowledge representation, 2000