There is not a single outward mark of courtesy that does not have a deep moral basis.

Self-knowledge comes from knowing other men.

It is easier to perceive error than to find truth, for the former lies on the surface and is easily seen, while the latter lies in the depth, where few are willing to search for it.

Of the book of books most wondrous is the tender book of love.

Man cannot persist long in a conscious state, he must throw himself back into the unconscious, for his root lives there.

It is natural to man to regard himself as the object of the creation, and to think of all things in relation to himself, and the degree in which they can serve and be useful to him.

Let no one be ashamed to say yes today if yesterday he said no. Or to say no today if yesterday he said yes. For that is life. Never to have changed-what a pitiable thing of which to boast!