In action a great heart is the chief qualification. In work, a great head.

Philosophy ... is a science, and as such has no articles of faith; accordingly, in it nothing can be assumed as existing except what is either positively given empirically, or demonstrated through indubitable conclusions.

The greatest of follies is to sacrifice health for any other kind of happiness.

Where there is no love, a person's faithfulness to the marriage bond is probably against nature.

It is only the man whose intellect is clouded by his sexual impulse that could give the name of the fair sex to that undersized, narrow-shouldered, broad-hipped, and short-legged race.

Music is the answer to the mystery of life. The most profound of all the arts, It expresses the deepest thoughts of life.

There is only one healing force, and that is nature; in pills and ointments there is none. At most they can give the healing force of nature a hint about where there is something for it to do.