A Treatise on the Soul.
Chapter 16. The Soul’s Parts. Elements of the Rational Soul
That position of Plato’s is also quite in keeping with the faith, in which he divides the soul into two parts—the rational and the irrational. To this definition we take no exception, except that we would not ascribe this twofold distinction to the nature (of the soul). It is the rational element which we must believe to be its natural condition, impressed upon it from its very first creation by its Author, who is Himself essentially rational. For how should that be other than rational, which God produced on His own prompting; nay more, which He expressly sent forth by His own afflatus or breath? The irrational element, however, we must understand to have accrued later, as having proceeded from the instigation of the serpent—the very achievement of (the first) transgression—which thenceforward became inherent in the soul, and grew with its growth, assuming the manner by this time of a natural development, happening as it did immediately at the beginning of nature. But, inasmuch as the same Plato speaks of the rational element only as existing in the soul of God Himself, if we were to ascribe the irrational element likewise to the nature which our soul has received from God, then the irrational element will be equally derived from God, as being a natural production, because God is the author of nature. Now from the devil proceeds the incentive to sin. All sin, however, is irrational: therefore the irrational proceeds from the devil, from whom sin proceeds; and it is extraneous to God, to whom also the irrational is an alien principle. The diversity, then, between these two elements arises from the difference of their authors.
When, therefore, Plato reserves the rational element (of the soul) to God alone, and subdivides it into two departments: the irascible, which they call θυμικόν , and the concupiscible, which they designate by the term ἐπιθυμητικόν (in such a way as to make the first common to us and lions, and the second shared between ourselves and flies, whilst the rational element is confined to us and God)—I see that this point will have to be treated by us, owing to the facts which we find operating also in Christ. For you may behold this triad of qualities in the Lord. There was the rational element, by which He taught, by which He discoursed, by which He prepared the way of salvation; there was moreover indignation in Him, by which He inveighed against the scribes and the Pharisees; and there was the principle of desire, by which He so earnestly desired to eat the passover with His disciples.
In our own cases, accordingly, the irascible and the concupiscible elements of our soul must not invariably be put to the account of the irrational (nature), since we are sure that in our Lord these elements operated in entire accordance with reason. God will be angry, with perfect reason, with all who deserve His wrath; and with reason, too, will God desire whatever objects and claims are worthy of Himself. For He will show indignation against the evil man, and for the good man will He desire salvation. To ourselves even does the apostle allow the concupiscible quality. “If any man,” says he, “desireth the office of a bishop, he desireth a good work.” Now, by saying “a good work,” he shows us that the desire is a reasonable one. He permits us likewise to feel indignation. How should he not, when he himself experiences the same? “I would,” says he, “that they were even cut off which trouble you.” In perfect agreement with reason was that indignation which resulted from his desire to maintain discipline and order. When, however, he says, “We were formerly the children of wrath,” he censures an irrational irascibility, such as proceeds not from that nature which is the production of God, but from that which the devil brought in, who is himself styled the lord or “master” of his own class, “Ye cannot serve two masters,” and has the actual designation of “father:” “Ye are of your father the devil.” So that you need not be afraid to ascribe to him the mastery and dominion over that second, later, and deteriorated nature (of which we have been speaking), when you read of him as “the sower of tares,” and the nocturnal spoiler of the crop of corn.
Chapter XVII.—The Fidelity of the Senses, Impugned by Plato, Vindicated by Christ Himself.
Then, again, when we encounter the question (as to the veracity of those five senses which we learn with our alphabet); since from this source even there arises some support for our heretics. They are the faculties of seeing, and hearing, and smelling, and tasting, and touching. The fidelity of these senses is impugned with too much severity by the Platonists, and according to some by Heraclitus also, and Diocles, and Empedocles; at any rate, Plato, in the Timæus, declares the operations of the senses to be irrational, and vitiated by our opinions or beliefs. Deception is imputed to the sight, because it asserts that oars, when immersed in the water, are inclined or bent, notwithstanding the certainty that they are straight; because, again, it is quite sure that that distant tower with its really quadrangular contour is round; because also it will discredit the fact of the truly parallel fabric of yonder porch or arcade, by supposing it to be narrower and narrower towards its end; and because it will join with the sea the sky which hangs at so great a height above it. In the same way, our hearing is charged with fallacy: we think, for instance, that that is a noise in the sky which is nothing else than the rumbling of a carriage; or, if you prefer it the other way, when the thunder rolled at a distance, we were quite sure that it was a carriage which made the noise. Thus, too, are our faculties of smell and taste at fault, because the selfsame perfumes and wines lose their value after we have used them awhile. On the same principle our touch is censured, when the identical pavement which seemed rough to the hands is felt by the feet to be smooth enough; and in the baths a stream of warm water is pronounced to be quite hot at first, and beautifully temperate afterwards.
Thus, according to them, our senses deceive us, when all the while we are (the cause of the discrepancies, by) changing our opinions. The Stoics are more moderate in their views; for they do not load with the obloquy of deception every one of the senses, and at all times. The Epicureans, again, show still greater consistency, in maintaining that all the senses are equally true in their testimony, and always so—only in a different way. It is not our organs of sensation that are at fault, but our opinion. The senses only experience sensation, they do not exercise opinion; it is the soul that opines. They separated opinion from the senses, and sensation from the soul. Well, but whence comes opinion, if not from the senses? Indeed, unless the eye had descried a round shape in that tower, it could have had no idea that it possessed roundness. Again, whence arises sensation if not from the soul? For if the soul had no body, it would have no sensation. Accordingly, sensation comes from the soul, and opinion from sensation; and the whole (process) is the soul. But further, it may well be insisted on that there is a something which causes the discrepancy between the report of the senses and the reality of the facts.
Now, since it is possible, (as we have seen), for phenomena to be reported which exist not in the objects, why should it not be equally possible for phenomena to be reported which are caused not by the senses, but by reasons and conditions which intervene, in the very nature of the case? If so, it will be only right that they should be duly recognised. The truth is, that it was the water which was the cause of the oar seeming to be inclined or bent: out of the water, it was perfectly straight in appearance (as well as in fact). The delicacy of the substance or medium which forms a mirror by means of its luminosity, according as it is struck or shaken, by the vibration actually destroys the appearance of the straightness of a right line. In like manner, the condition of the open space which fills up the interval between it and us, necessarily causes the true shape of the tower to escape our notice; for the uniform density of the surrounding air covering its angles with a similar light obliterates their outlines. So, again, the equal breadth of the arcade is sharpened or narrowed off towards its termination, until its aspect, becoming more and more contracted under its prolonged roof, comes to a vanishing point in the direction of its farthest distance. So the sky blends itself with the sea, the vision becoming spent at last, which had maintained duly the boundaries of the two elements, so long as its vigorous glance lasted. As for the (alleged cases of deceptive) hearing, what else could produce the illusion but the similarity of the sounds? And if the perfume afterwards was less strong to the smell, and the wine more flat to the taste, and the water not so hot to the touch, their original strength was after all found in the whole of them pretty well unimpaired.
In the matter, however, of the roughness and smoothness of the pavement, it was only natural and right that limbs like the hands and the feet, so different in tenderness and callousness, should have different impressions. In this way, then, there cannot occur an illusion in our senses without an adequate cause. Now if special causes, (such as we have indicated,) mislead our senses and (through our senses) our opinions also, then we must no longer ascribe the deception to the senses, which follow the specific causes of the illusion, nor to the opinions we form; for these are occasioned and controlled by our senses, which only follow the causes.
Persons who are afflicted with madness or insanity, mistake one object for another. Orestes in his sister sees his mother; Ajax sees Ulysses in the slaughtered herd; Athamas and Agave descry wild beasts in their children. Now is it their eyes or their phrenzy which you must blame for so vast a fallacy? All things taste bitter, in the redundancy of their bile, to those who have the jaundice. Is it their taste which you will charge with the physical prevarication, or their ill state of health?
All the senses, therefore, are disordered occasionally, or imposed upon, but only in such a way as to be quite free of any fault in their own natural functions. But further still, not even against the specific causes and conditions themselves must we lay an indictment of deception. For, since these physical aberrations happen for stated reasons, the reasons do not deserve to be regarded as deceptions. Whatever ought to occur in a certain manner is not a deception. If, then, even these circumstantial causes must be acquitted of all censure and blame, how much more should we free from reproach the senses, over which the said causes exercise a liberal sway! Hence we are bound most certainly to claim for the senses truth, and fidelity, and integrity, seeing that they never render any other account of their impressions than is enjoined on them by the specific causes or conditions which in all cases produce that discrepancy which appears between the report of the senses and the reality of the objects.