Know that people belong to two categories—that is to say, they constitute two parties. One party deny the spirit and say that man also is a species of animal; for they say: Do we not see that animals and men share the same powers and senses? These simple, single elements which fill space are endlessly combined, and from each of these combinations one of the beings is produced. Among these beings is the possessor of spirit,(140) of the powers and of the senses. The more perfect the combination, the nobler is the being. The combination of the elements in the body of man is more perfect than the composition of any other being; it is mingled in absolute equilibrium; therefore, it is more noble and more perfect. “It is not,” they say, “that he has a special power and spirit which the other animals lack: animals possess sensitive bodies, but man in some powers has more sensation, although, in what concerns the outer senses, such as hearing, sight, taste, smell, touch and even in some interior powers like memory, the animal is more richly endowed than man.” “The animal, too,” they say, “has intelligence and perception.” All that they concede is that man’s intelligence is greater. This is what the philosophers of the present state; this is their saying, this is their supposition, and thus their imagination decrees. So with powerful arguments and proofs they make the descent of man go back to the animal, and say that there was once a time when man was an animal, that then the species changed and progressed little by little until it reached the present status of man.