There are three traps that strangle philosophy: The church, the marriage bed, and the professor's chair.

The diseases which destroy a man are no less natural than the instincts which preserve him.

The hunger for facile wisdom is the root of all false philosophy.

There are books in which the footnotes, or the comments scrawled by some reader's hand in the margin, are more interesting than the text. The world is one of those books.

The existence of any evil anywhere at any time absolutely ruins a total optimism.

Before he sets out, the traveler must possess fixed interests and facilities to be served by travel.

Wisdom lies in taking everything with good humor and a grain of salt.