The first wealth is health.

Science does not know its debt to imagination.

Character is higher than intellect. A great soul will be strong to live as well as think.

Common sense is genius dressed in its working clothes.

Genius always finds itself a century too early.

Knowledge is knowing that we cannot know.

He who is not everyday conquering some fear has not learned the secret of life.

No man ever prayed heartily without learning something.

All life is an experiment. The more experiments you make the better.

It is not length of life, but depth of life.