Every man is to be respected as an absolute end in himself; and it is a crime against the dignity that belongs to him as a human being, to use him as a mere means for some external purpose.

Life is the faculty of spontaneous activity, the awareness that we have powers.

The desire which a man has for a woman is not directed towards her because she is a human being, but because she is a woman ; that she is a human being is of no concern to the man; only her sex is the object of his desires.

Act so as to use humanity, yourself and others, always as an end and never as a means to an end.

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

Reason can never prove the existence of God.

Act only according to that maxim whereby you can at the same time will that it should become a universal law.