Immanuel Kant

Feminine traits are called weaknesses. People joke about them; fools ridicule them; but reasonable persons see very well that those traits are just the tools for the management of men, and for the use of men for female designs.

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity.

The greatest problem for the human species, the solution of which nature compels him to seek, is that of attaining a civil society which can administer justice universally.

THERE ARE TWO THINGS that don't have to mean anything, one is music and the other is laughter.

We can never, even by the strictest examination, get completely behind the secret springs of action.

[Aristotle formal logic thus far (1787)] has not been able to advance a single step, and hence is to all appearances closed and completed.

The two great dividers are religion and LANGUAGE

The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth

Natural science physics contains in itself synthetical judgments a priori, as principles. ... Space then is a necessary representation a priori, which serves for the foundation of all external intuitions.

The hand is the visible part of the brain.

When I could have used a wife, I could not support one; and when I could support one, I no longer needed any

Man must be disciplined, for he is by nature raw and wild.

A society that is not willing to demand a life of somebody who has taken somebody else’s life is simply immoral.

Standing armies shall in time be totally abolished.

Through laziness and cowardice a large part of mankind, even after nature has freed them from alien guidance, gladly remain immature. It is because of laziness and cowardice that it is so easy for others to usurp the role of guardians. It is so comfortable to be a minor!

I have no knowledge of myself as I am, but merely as I appear to myself.

Man's greatest concern is to know how he shall properly fill his place in the universe and correctly understand what he must be in order to be a man.

Give me matter, and I will construct a world out of it!

The ultimate destiny of the human race is the greatest moral perfection, provided that it is achieved through human freedom, whereby alone man is capable of the greatest happiness.

The death of dogma is the birth of morality.

If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds advantage to himself.