Until he extends his circle of love to all living things, man will not himself find peace.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

Happiness is nothing more than good health and a bad memory.

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.