A matter of principle; the vital spirit.
McGirr
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EM
D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D010686:Philosophy, Medical; D014799:Vitalism / Q000266:history*