1
But seeing that Xenocrates won to his opinions several of the most eminent philosophers, while he defined the substance of the soul to be number moved by itself; and that many adhered to Crantor the Solian, who affirmed the soul to consist partly of an essence perceptible to the mind, partly of a nature concerned with sensible things and subject to opinions; I am apt to believe that the perspicuity of these matters clearly dilucidated will afford you a fair entrance into the knowledge of the rest.
2
Nor does either of the two conjectures require many words of explanation. For the one side pretends that by the mixture of the’ divisible and indivisible substance no other thing is meant than the generation or original of number, seeing that the unit is undividable but multitude is subject to division; however, that out of these is begot number, unity terminating plurality and putting a period to infinity, which they call the unlimited binary. This binary Zaratas, the scholar of Pythagoras, named the mother, but the unit the father of number; and therefore he believed those numbers were the best which approached nearest in resemblance to the unit. Nevertheless, this number cannot be said to be the soul; for it neither has the power to move, neither can it be moved. But the Same and the Other being blended together, of which one is the original of motion and mutation, the other of rest and stability, from these two springs the soul, which is no less active or passive itself to stay or to be stayed, than to move or to be moved.