Happiness is nothing more than good health and a bad memory.

Soldiers' graves are the greatest preachers of peace.

Because I have confidence in the power of truth, and of the spirit, I have confidence in the future of mankind.

The doctor of the future will be oneself.

There is within each of us a modulation, an inner exaltation, which lifts us above the buffetings with which events assail us. Likewise, it lifts us above dependence upon the gifts of events for our joy.

The friend of nature is the man who feels himself inwardly united with everything that lives in nature, who shares in the fate of all creatures, helps them when he can in their pain and need, and as far as possible avoids injuring or taking life.

The first step in the evolution of ethics is a sense of solidarity with other human beings.