Each according to his own way of seeing things, seek one goal, that is gratification.

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].

The yellow Indians do have a meagre talent. The Negroes are far below them, and at the lowest point are a part of the American people.

. . . as to moral feeling, this supposed special sense, the appeal to it is indeed superficial when those who cannot think believe that feeling will help them out, even in what concerns general laws: and besides, feelings which naturally differ infinitely in degree cannot furnish a uniform standard of good and evil, nor has any one a right to form judgments for others by his own feelings. . . .

Science is organized knowledge. Wisdom is organized life.

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.

A lie is the abandonment and, as it were, the annihilation of the dignity by man.