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Some there are who are nothing else than a passage for food and augmentors of excrement and fillers of privies, because through them no other things in the world, nor any good effects are produced, since nothing but full privies results from them.

Leonardo Da VinciXIX Philosophical Maxims. Morals. Polemics and Speculations in The Notebooks of Leonardo da Vinci (Richter, 1888)