Intellect really exists in its products; its kingdom is here.

The first man of science was he who looked into a thing, not to learn whether it furnished him with food, or shelter, or weapons, or tools, armaments, or playwiths but who sought to know it for the gratification of knowing.

Brute animals have the vowel sounds; man only can utter consonants.

There is one art of which people should be masters - the art of reflection.

No mind is thoroughly well organized that is deficient in a sense of humor.

One thought includes all thought, in the sense that a grain of sand includes the universe.

It is a flat'ning Thought, that the more we have seen, the less we have to say.