There is a courtesy of the heart; it is allied to love. From its springs the purest courtesy in the outward behavior.

No limit, no definition, may restrict the range or depth of the human spirit's passage into its own secrets or the world's.

Let's plunge ourselves into the roar of time, the whirl of accident; may pain and pleasure, success and failure, shift as they will -- it's only action that can make a man.

Our friends show us what we can do; our enemies teach us what we must do.

Faust: Who holds the devil, let him hold him well, He hardly will be caught a second time.

The greatest evil that can befall man is that he should come to think ill of himself.

There is nothing worse than aggressive stupidity.