It is not when truth is dirty, but when it is shallow, that the lover of knowledge is reluctant to wade into its waters.

We read the world wrong and say that it deceives us. The poet who walks by moonlight knows that the moon is the sun and that the darkness is a brilliant day.

The chief danger of our age is that all mankind should be sunk in a depression of the same kind, all held in the same mold by the oppressiveness of a system of thought in which there is neither criticism of life nor xiety about truth.

The great tragedy of science—the slaying of a beautiful hypothesis by an ugly fact.