"Aristotle taught that the brain exists merely to cool the blood and is not involved in the process of thinking. This is true only of certain persons."

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Blood mixture and the result drop in the racial level is the sole cause of the dying out of old cultures; for men do not perish as a result of lost wars, but by the loss of that force of resistance which is continued only in pure blood. All who are not of good race in this world are chaff.

— Adolf Hitler