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Physiologists should think carefully about setting up the drive to preserve the self as the cardinal drive in an organic being. Above everything else, something living wants to release its power - living itself is will to power. Self-preservation is only one of the indirect and most frequent consequences of that. In short, here as everywhere, beware of extraneous teleological principles! The drive for self-preservation is one such principle (we have Spinoza's inconsistency to thank for it -). For the essential principle of economy must hold - that's what method demands.