When two men of science disagree, they do not invoke the secular arm; they wait for further evidence to decide the issue, because, as men of science, they know that neither is infallible. But when two theologians differ, since there is no criteria to which either can appeal, there is nothing for it but mutual hatred and an open or covert appeal to force.

All the conditions of happiness are realized in the life of the man of science.

There is much pleasure to be gained from useless knowledge.

I hold all knowledge that is concerned with things that actually exist - all that is commonly called Science - to be of very slight value compared to the knowledge which, like philosophy and mathematics, is concerned with ideal and eternal objects, and is freed from this miserable world which God has made.

No matter how eloquently a dog may bark, he cannot tell you that his parents were poor, but honest.

Mathematics is only the art of saying the same thing in different words.

Vanity is a motive of immense potency.