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One more point remains. Modern philosophers say: "We have never seen the spirit in man, and in spite of our researches into the secrets of the human body, we do not perceive a spiritual power. How can we imagine a power which is not sensible?" The theologians reply: "The spirit of the animal also is not sensible, and through its bodily powers it cannot be perceived. By what do you prove the existence of the spirit of the animal? There is no doubt that from its effects you prove that in the animal there is a power which is not in the plant, and this is the power of the senses-- that is to say, sight, hearing and also other powers; from these you infer that there is an animal spirit. In the same way, from the proofs and signs we have mentioned, we argue that there is a human spirit. Since in the animal there are signs which are not in the plant, you say this power of sensation is a property of the animal spirit; you also see in man signs, powers and perfections which do not exist in the animal; therefore, you infer that there is a power in him which the animal is without."
(189:2)
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