You must learn to understand the secret of gratitude. It is more than just so-called virtue. It is revealed to you as a mysterious law of existence. In obedience to it we have to fulfill our destiny.

What we call love is in its essence reverence for life.

The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.

Ethics, too, are nothing but reverence for life. This is what gives me the fundamental principle of morality, namely, that good consists in maintaining, promoting, and enhancing life, and that destroying, injuring, and limiting life are evil.

Renunciation of thinking is a declaration of spiritual bankruptcy.

Life becomes harder for us when we live for others, but it also becomes richer and happier.

An idea is, in the end, always stronger than circumstances.