The relation of the individual person to the species he belongs to is the most intimate of all relations.

There is nothing more fragile than civilization.

The absence of flaw in beauty is itself a flaw.

Charm" — which means the power to effect work without employing brute force — is indispensable to women. Charm is a woman's strength just as strength is a man's charm.

The by-product is sometimes more valuable than the product.

Dancing is the loftiest, the most moving, the most beautiful of the arts, because it is no mere translation or abstraction from life; it is life itself.

The mathematician has reached the highest rung on the ladder of human thought.