An excerpt from his classic essay, On Ending and Mending Things:
A certain politician (whom I would not discuss here on any account) once said of a certain institution (which wild horses shall not induce me to name) that “It must be mended or ended.” Few people who use this useful phrase about reform notice the important thing about it. The important thing about it is that the two methods described here are not similar but opposite; between mending and ending that is not a difference of degree but of vital antagonism of kind. Mending is based upon the idea that the original nature of a thing is good; ending is based upon the idea that the original nature of a thing is bad or at least, has lost all power of being good.
If I “mend” an armchair it is because I want an armchair. I mend the armchair because I wish to restore it to a state of more complete armchairishness. My objection to the armchair in its unmended state is that its defects prevent it from being in the fullest sense an armchair at all. If (let us say) the back has come off and three of the legs have disappeared, I realize, in looking at it, not merely that it presents a sense of general irregularity to the eye; I realize that in such and such respects it does definitely fall short of the Divine and Archetypal Armchair, which, as Plato would have pointed out, exists in heaven.
But it is possible that I might possess among my drawing room furniture some object, let us say a rack or a thumbscrew, of which the nature and raison d’être was repellent to my moral feelings. If my thumbscrew fell into slight disrepair, I should not mend it at all; because the more I mended my thumbscrew the more thumbscrewy it would be. If my private rack were out of order, I should be in no way disturbed; for my private code of ethics prevents me from racking anyone, and the more it was out of order the less likely it would be that any casual passer-by could get racked on it.
This was a man with clear moral principles. When he needed an example of something that was obviously evil, and that everyone would agree was evil, he chose torture devices.