"The folkish state must not adjust its entire educational work primarily to the inoculation of mere knowledge, but to the breeding of absolutely healthy bodies. The training of mental abilities is only secondary."

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Take sex away from people. Make it forbidden, evil. Limit it to ritualistic breeding. Force it to back up into suppressed sadism. Then hand the people a scapegoat to hate. Let them kill a scapegoat occasionally for cathartic release. The mechanism is ages old. Tyrants used it centuries before the word "psychology" was ever invented. It works, too.

— Robert A. Heinlein