Great art is deeply ordered. Even if within the order there may be enormously instinctive and accidental things, nevertheless they come out of a desire for ordering and for returning fact onto the nervous system in a more violent way.

I regret not starting to paint earlier...It is one of the few things I do regret.

Revenge is a kind of wild justice.

In mathematics I can report no deficiency, except it be that men do not sufficiently understand the excellent use of Pure Mathematics.

Half of science is putting forth the right questions.

We cannot command Nature except by obeying her.

Habit, if wisely and skillfully formed, becomes truly a second nature; but unskillfully and unmethodically depicted, it will be as it were an ape of nature, which imitates nothing to the life, but only clumsily and awkwardly