There is no cosmetic for beauty like happiness.

The phrase ‘popular science’ has in itself a touch of absurdity. That knowledge which is popular is not scientific.

Every formula which expresses a law of nature is a hymn of praise to God.

Study as if you were going to live forever live as if you were going to die tomorrow.

We travel to learn and I have never been in any country where they did not do something better than we do it think some thoughts better than we think catch some inspiration from heights above our own.

Why can a man not act himself be himself and think for himself? It seems to me that naturalness alone is power that a borrowed word is weaker than our own weakness however small we may be.

For women there are undoubtedly great difficulties in the path but so much the more to overcome. First no woman would say "I am but a woman!" But a woman! What more can you ask to be?