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Science is organized knowledge. Wisdom is organized life.

Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.

So act that your principle of action might safely be made a law for the whole world.

The death of dogma is the birth of morality.

The greatest problem for the human race, to the solution of which Nature drives man, is the achievement of a universal civic society which administers law among men.

The master is himself an animal, and needs a master.

The means employed by Nature to bring about the development of all the capacities of men is their antagonism in society, so far as this is, in the end, the cause of a lawful order among men.

The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason.

There can be no doubt that all our knowledge begins with experience.

This problem is the most difficult and the last to be solved by mankind.