A friend is a person with whom I may be sincere. Before him I may think aloud. I am arrived at last in the presence of a man so real and equal, that I may drop even those undermost garments of dissimulation, courtesy, and second thought, which men never put off, and may deal with him with the simplicity and wholeness with which one chemical atom meets another.

There is no good theory of disease which does not at once suggest a cure.

Common sense is genius dressed in its working clothes.

Man moves in all modes, by legs of horses, by wings of winds, by steam, by gas of balloon, by electricity, and stands on tiptoe threatening to hunt the eagle in his own element.

Society always consists in the greatest part, of young and foolish persons.

The religion which is to guide and fulfill the present and coming ages, whatever else it be, must be intellectual. The scientific mind must have a faith which is science.

The value of a dollar is social, as it is created by society.