He who does not expect a million readers should not write a line.

As long as you are not aware of the continual law of Die and Be Again, you are merely a vague guest on a dark Earth.

Superstition is the poetry of life. It is inherent in man's nature; and when we think it is wholly eradicated, it takes refuge in the strangest holes and corners, whence it peeps out all at once, as soon as it can do it with safety.

There is nothing so terrible as activity without insight.

There is no past we can bring back by longing for it. There is only an eternal now that builds and creates out of the past something new and better.

Alas, I have studied philosophy, the law as well as medicine, and to my sorrow, theology; studied them well with ardent zeal, yet here I am, a wretched fool, no wiser than I was before.

All theory, dear friend, is gray, but the golden tree of life springs ever green.