Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

If a good person does you wrong, act as though you had not noticed it. If we practice and eye for an eye and a tooth for a tooth, soon the wholeworld will be blind and toothless.

Upon the creatures we have made, we are, ourselves, at last, dependent.

Love, whose power youth feels, is not suitable for the elderly, just as little as anything that presupposes productivity. It is rare that productivity lasts through the years.

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.

Self-love exaggerates our faults as well as our virtues.

But who will dare to speak the truth out clear? The few who anything of truth have learned, And foolishly did not keep truth concealed, Their thoughts and visions to the common herd revealed, Since time began we've crucified and burned