Knowledge is power but only wisdom is liberty.

Those who have suffered much become very bitter or very gentle.

Sixty years ago I knew everything. Now I know nothing. Education is a progressive discovery of our own ignorance.

Every form of government tends to perish by excess of its basic principle.

Our knowledge is a receding mirage in an expanding desert of ignorance.

To seek, beneath the universal strife, the hidden harmony of things.

In progressive societies the concentration[of wealth] may reach a point where the strength of number in the many poor rivals the strength of ability in the few rich; then the unstable equilibrium generates a critical situation, which history has diversely met by legislation redistributing wealth or by revolution distributing poverty.