"There lies before us, if we choose, continual progress in happiness, knowledge and wisdom. Shall we instead choose death, because we cannot forget our quarrels? I appeal as a human being to human beings; remember your humanity, and forget the rest."
"Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts."
"What is wanted is not the will to believe, but the will to find out, which is the exact opposite."
"The secret of happiness is to face the fact that the world is horrible, horrible, horrible."
"Man needs, for his happiness, not only the enjoyment of this or that, but hope and enterprise and change."
"The good life is one inspired by love and guided by knowledge."