Errors belong to libraries; truth, to the human mind.

All that is alive tends toward color, individuality, specificity, effectiveness and opacity. All that is done with life inclines toward knowledge, abstraction, generality transfiguration and transparency.

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

If man thinks about his physical or moral state he usually discovers that he is ill.

Plunge boldly into the thick of life, and seize it where you will, it is always interesting.

The man with insight enough to admit his limitations comes nearest to perfection.

To understand one thing well is better than understanding many things by halves.