What, then, is the power in this small body of man which encompasses all this? What is this ruling power by which he subdues all things? (307:1)

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." (307:2)

If we wish to deny everything that is not sensible, then we must deny the realities which unquestionably exist. For example, ethereal matter is not sensible, though it has an undoubted existence. The power of attraction is not sensible, though it certainly exists. From what do we affirm these existences? From their signs. Thus this light is the vibration of that ethereal matter, and from this vibration we infer the existence of ether. (307:3)

MAN AND EVOLUTION
Certain European philosophers agree that the species grows and develops, and that even change and alteration are also possible. One of the proofs that they give for this theory is that through the attentive study and verification of the science of geology it has become clear that the existence of the vegetable preceded that of the animal, and that of the animal preceded that of man. They admit that both the vegetable and the animal species have changed, for in some of the strata of the earth they have discovered plants which existed in the past and are now extinct; they have progressed, grown in strength, their form and appearance have changed, and so the species have altered. In the same way, in the strata of the earth there are some species of animals which have changed and are transformed. One of these animals is the serpent. There are indications that the serpent once had feet; but through the lapse of time those members have disappeared. In the same way, in the vertebral column of man there is an indication which amounts to a proof that, like other animals, he once had a tail. At one time that member was useful, but when man developed it was no longer of use, and therefore it gradually disappeared. As the serpent took refuge under the ground, and became a creeping animal, it was no longer in need of feet, so they disappeared; but their traces survive. The principal argument is this: that the existence of traces of members proves that they once existed; and as now they are no longer of service, they have gradually disappeared. Therefore while the perfect and necessary members have remained, those which are unnecessary have gradually disappeared by the modification of the species, but the traces of them continue. (307:4)

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