Technology made large populations possible; large populations now make technology indispensable.

Man is the only one in whom the instinct of life falters long enough to enable it to ask the question "Why?

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

The human mind can appreciate the One only by seeing it first in the Many.

If we are deprived of hope as well as fear, we are compensated by being given an almost endless patience for enduring or simply for waiting.

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.

Happiness is a kind of gratitude and vice versa.