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To study Physiology ↖ Beyond Good and Evil with a clear conscience, one must insist on the fact that the sense-organs are not phenomena in the sense of the idealistic philosophy; as such they certainly could not be causes! Sensualism ↖ Beyond Good and Evil , therefore, at least as regulative hypothesis, if not as heuristic principle. What? And others say even that the external world is the work of our organs? But then our body, as a part of this external world, would be the work of our organs! But then our organs themselves would be the work of our organs! It seems to me that this is a complete reductio ad absurdum, if the conception Causa sui ↖ Beyond Good and Evil ↖ Metaphysics is something fundamentally absurd. Consequently, the external world is not the work of our organs—?