“. . . full sexual consciousness and a natural regulation of sexual life mean the end of mystical feelings of any kind, that, in other words, natural sexuality is the deadly enemy of mystical religion. The church, by making the fight over sexuality the center of its dogmas and of its influence over the masses, confirms this concept.”
“The fact that political ideologies are tangible realities is not a proof of their vitally necessary character. The bubonic plague was an extraordinarily powerful social reality, but no one would have regarded it as vitally necessary.”
“Honest pioneer work in the field of science has always been, and will continue to be, life's pilot. On all sides, life is surrounded by hostility. This puts us under an obligation.”