Aristotle, a man superior to all others, both in genius and industry (I always except Plato), after having embraced these four known sorts of principles, from which all things deduce their origin, imagines that there is a certain fifth nature, from whence comes the soul; for to think, to foresee, to learn, to teach, to invent anything, and many other attributes of the same kind, such as to remember, to love, to hate, to desire, to fear, to be pleased or displeased--these, and others like them, exist, he thinks, in none of those first four kinds: on such account he adds a fifth kind, which has no name, and so by a new name he calls the soul [Greek: endelecheia], as if it were a certain continued and perpetual motion.
XI.

If I have not forgotten anything unintentionally, these are the principal opinions concerning the soul.

I have omitted Democritus, a very great man indeed, but one who deduces the soul from the fortuitous concourse of small, light, and round substances; for, if you believe men of his school, there is nothing which a crowd of atoms cannot effect.

Which of these opinions is true, some God must determine.

It is an important question for us, Which has the most appearance of truth?
Shall we, then, prefer determining between them, or shall we return to our subject?
_A._ I could wish both, if possible; but it is difficult to mix them: therefore, if without a discussion of them we can get rid of the fears of death, let us proceed to do so; but if this is not to be done without explaining the question about souls, let us have that now, and the other at another time.
_M._ I take that plan to be the best, which I perceive you are inclined to; for reason will demonstrate that, whichever of the opinions which I have stated is true, it must follow, then, that death cannot be an evil; or that it must rather be something desirable; for if either the heart, or the blood, or the brain, is the soul, then certainly the soul, being corporeal, must perish with the rest of the body; if it is air, it will perhaps be dissolved; if it is fire, it will be extinguished; if it is Aristoxenus's harmony, it will be put out of tune.