Beneficence is a duty.

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.

Have the courage to use your own reason- That is the motto of enlightenment. "Foundations of the Metaphysics of Morals" (1785)

Suicide is not abominable because God prohibits it; God prohibits it because it is abominable.

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity; and is independence on the will and co-action of every other in so far as this consists with every other person's freedom.

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

Reason can never prove the existence of God.