Let each hour of the day have its allotted duty, and cultivate that power of concentration which grows with its exercise.

Happiness lies in the absorption in some vocation which satisfies the soul.

Medicine is a science of uncertainty and an art of probability.

To know just what has do be done, then to do it, comprises the whole philosophy of practical life.

The future belongs to Science. More and more she will control the destinies of the nations. Already she has them in her crucible and on her balances.

A man is sane morally at thirty, rich mentally at forty, wise spiritually at fifty-or never!

The most essential thing for happiness is the gift of friendship.