“[P]leasure is in itself a good; nay, even setting aside immunity from pain, the only good: pain is in itself an evil; and, indeed, without exception, the only evil; or else the words good and evil have no meaning. And this is alike true of every sort of pain, and of every sort of pleasure.”
Source: An Introduction to the Principles of Morals and Legislation (1789; 1823), Ch. 10: Of Motives
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Jeremy Bentham 30
British philosopher, jurist, and social reformer 1748–1832Related quotes

Mythopoeia (1931)

Source: From Max Weber: Essays in Sociology
Source: From Max Weber: Essays in Sociology (1946), p. 124; Essay "Politics as a vocation"
Context: The problem — the experience of the irrationality of the world — has been the driving force of all religious evolution. The Indian doctrine of karma, Persian dualism, the doctrine of original sin, predestination and the deus absconditus, all these have grown out of this experience. Also the early Christians knew full well the world is governed by demons and that he who lets himself in for politics, that is, for power and force as means, contracts with diabolical powers and for his action it is not true that good can follow only from good and evil only from evil, but that often the opposite is true. Anyone who fails to see this is, indeed, a political infant.

“Is there evil but on earth? or pain in every peopled sphere?”
Source: Locksley Hall Sixty Years After (1886), Line 197
Strange Horizons interview (2008)
Context: The Inquisition, by defining and limiting knowledge, was evil. The Taliban, by defining truth and refusing girls an education, is evil. Any religion that says it knows the one and only truth is evil, because it limits knowledge. Any political body that says it owns the truth is evil. Same reason.
Any repressive regime that seeks to control exploration and experimentation is evil. Same reason. Any regime that defines truth as a set of beliefs and occurrences that cannot be questioned, that can neither be demonstrated nor proven is not only evil but ridiculous. This includes all mythologies, miracles, etc. because, if creation happened for a reason, if it was done by God, you'd better believe every part of it, including intelligence, was done for a reason ascertainable, eventually, by intelligence. We would not follow and adore a ruler who lied and tortured. Why would we worship a God who did either? God doesn't lie and he/she/it doesn't fool around!
Shutting down inquiry is evil. Causing pain purposefully for no reason is evil. Enjoying causing pain by shutting down inquiry is an absolute evil.