A man's style is his mind's voice. Wooden minds, wooden voices.

Cultivate an attitude of gratitude, of giving and forgiving. Nothing can bring you peace but yourself.

A man of thought must feel the thought that is parent of the universe: that the masses of nature do undulate and flow.

Men love to wonder, and that is the seed of our science, and such is the mechanical determination of our age, and so recent are our best contrivances, that use has not dulled our joy and pride in them. These arts open great gates of a future, promising to make the world plastic and to lift human life out of its beggary to a godlike ease and power.

We are the children of many sires, and every drop of blood in us in its turn betrays its ancestor.

Truly speaking, it is not instruction, but provocation, that I can receive from another soul. What he announces, I must find true in me, or reject; and on his word, or as his second, be he who he may, I can accept nothing.

Whenever a true theory appears, it will be its own evidence. Its test is, that it will explain all phenomena.