Philosophy is the true mother of science.

Vivere est cogitare. (To think is to live)

The leaders should all relate to this principle: the governed must be as happy as possible.

Nothing stands out so conspicuously, or remains so firmly fixed in the memory, as something which you have blundered.

Our character is not so much the product of race and heredity as of those circumstances by which nature forms our habits, by which we are nurtured and live.

A war is never undertaken by the ideal state, except in defense of its honor or its safety.

In a disordered mind, as in a disordered body, soundness of health is impossible.