Rhetoric takes no real account of the art in literature and morality takes no account of the art in life.

Both the cockroach and the bird would get along very well without us, although the cockroach would miss us most.

To those who study her, Nature reveals herself as extraordinarily fertile and ingenious in devising means, but she has no ends which the human mind has been able to discover or comprehend.

The most important part of our lives-our sensations, emotions, desires, and aspirations-takes place in a universe of illusions which science can attenuate or destroy, but which it is powerless to enrich.

Happiness is a kind of gratitude and vice versa.

Not to have known - as most men have not - either the mountain or the desert is not to have known one's self. Not to have known one's self is to have known no one.

Love is ...not a fact in nature of which we become aware, but rather a creation of the human imagination.