Always regard every man as an end in himself, and never use him merely as a means to your ends [i.e., respect that each person has a life and purpose that is their own; do not treat people as objects to be exploited].

Marriage...is the union of two people of different sexes with a view to the mutual possession of each other's sexual attributes for the duration of their lives.

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

Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.

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

God put a secret art into the forces of Nature so as to enable it to fashion itself out of chaos into a perfect world system.

There will always be some people who think for themselves, even among the self-appointed guardians of the great mass who, after having thrown off the yoke of immaturity themselves, will spread about them the spirit of a reasonable estimate of their own value and of the need for every man to think for himself.