Metaphysics has as the proper object of its enquiries three ideas only: God, freedom, and immortality. Critique of Pure Reason (1781)
The humiliating difference between laymen and clergymen must disappear, and equality spring from true liberty.
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.