Animal sacrifices do not belong in any way to the worship of God but to the worship of demons. They come near to, and are even used in, some forms of black magic. Whenever temples were turned into slaughterhouses in the past, and in certain lands still today, religion takes its lowest form, becomes pseudo-religion. Still lower were the rites of human sacrifice. Both kinds are concessions to, or expressions of, the killing instinct so marked in unevolved humans.
-- Notebooks Category 17: The Religious Urge > Chapter 2: Organization, Content of Religion > # 87
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