The poets have been mysteriously silent on the subject of cheese.

Modern masters of science are much impressed with the need of beginning all inquiry with a fact. The ancient masters of religion were quite equally impressed with that necessity. They began with the fact of sin-a fact as practical as potatoes. Whether or not man could be washed in miraculous waters, there was no doubt at any rate that he wanted washing.

I have argued with him on almost every subject in the world, and we have always been on opposite sides, without affectation or animosity... It is necessary to disagree with him as much as I do, in order to admire him as I do; and I am proud of him as a foe even more than as a friend.

It is the first law of practical courage. To be in the weakest camp is to be in the strongest school.

A man does not know what he is saying until he knows what he is not saying.

The artistic temperament is a disease that afflicts amateurs. It is a disease which arises from men no having sufficient power of expression to utter and get rid of the element of art in their being.

If I think the universe is triangular, and you think it is square, there cannot be room for two universes. We may argue politely, we may argue humanely, we may argue with great mutual benefit: but, obviously, we must argue.