Immanuel Kant

The concept of freedom is the keystone of the whole edifice of a system of pure reason.

The existence of God, freedom, and immortality are postulates of practical reason.

Live your life as though your every act were to become a universal law.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

Experience without theory is blind, but theory without experience is mere intellectual play.

Man is an animal that, so long as he lives among other animals of his species, needs a master.

Dare to know! (Sapere aude.) 'Have courage to use your own understanding!'—that is the motto of enlightenment.

Happiness is not an ideal of reason but of imagination.

The greatest human endeavor is the striving for a good character.

Science is organized knowledge. Wisdom is organized life.

Act in such a way that you treat humanity, whether in your own person or in the person of any other, never simply as a means, but always at the same time as an end.

The Negroes of Africa have by nature no feeling that rises above the trifling.

Humanity is at its greatest perfection in the race of the whites.

The Jews still cannot claim any true genius, any truly great man.

Women will avoid the wicked not because it is unright, but because it is ugly.

The Hindus always stay children and do not reach the maturity of judgment.

A woman is embarrassed little that she does not possess high insights... her beauty compensates for everything.

The American Indians are too weak for hard labor, too indifferent for industry, and incapable of any culture.

The Chinese are a race of liars.

The Jews are a nation of cheaters.