City of God, Book VIII
And not these only, but to these great acknowledgers of so great a God, those philosophers must yield who, having their mind enslaved to their body, supposed the principles of all things to be material; as Thales, who held that the first principle of all things was water; Anaximenes, that it was air; the Stoics, that it was fire; Epicurus, who affirmed that it consisted of atoms, that is to say, of minute corpuscules; and many others whom it is needless to enumerate, but who believed that bodies, simple or compound, animate or inanimate, but nevertheless bodies, were the cause and principle of all things. For some of them—as, for instance, the Epicureans—believed that living things could originate from things without life; others held that all things living or without life spring from a living principle, but that, nevertheless, all things, being material, spring from a material principle. For the Stoics thought that fire, that is, one of the four material elements of which this visible world is composed, was both living and intelligent, the maker of the world and of all things contained in it,—that it was in fact God.
These and others like them have only been able to suppose that which their hearts enslaved to sense have vainly suggested to them. And yet they have within themselves something which they could not see: they represented to themselves inwardly things which they had seen without, even when they were not seeing them, but only thinking of them. But this representation in thought is no longer a body, but only the similitude of a body; and that faculty of the mind by which this similitude of a body is seen is neither a body nor the similitude of a body; and the faculty which judges whether the representation is beautiful or ugly is without doubt superior to the object judged of. This principle is the understanding of man, the rational soul; and it is certainly not a body, since that similitude of a body which it beholds and judges of is itself not a body. The soul is neither earth, nor water, nor air, nor fire, of which four bodies, called the four elements, we see that this world is composed.
And if the soul is not a body, how should God, its Creator, be a body? Let all those philosophers, then, give place, as we have said, to the Platonists, and those also who have been ashamed to say that God is a body, but yet have thought that our souls are of the same nature as God. They have not been staggered by the great changeableness of the soul,—an attribute which it would be impious to ascribe to the divine nature,—but they say it is the body which changes the soul, for in itself it is unchangeable. As well might they say, “Flesh is wounded by some body, for in itself it is invulnerable.” In a word, that which is unchangeable can be changed by nothing, so that that which can be changed by the body cannot properly be said to be immutable.
Chapter 6.—Concerning the Meaning of the Platonists in that Part of Philosophy Called Physical.
These philosophers, then, whom we see not undeservedly exalted above the rest in fame and glory, have seen that no material body is God, and therefore they have transcended all bodies in seeking for God. They have seen that whatever is changeable is not the most high God, and therefore they have transcended every soul and all changeable spirits in seeking the supreme. They have seen also that, in every changeable thing, the form which makes it that which it is, whatever be its mode or nature, can only be through Him who truly is, because He is unchangeable. And therefore, whether we consider the whole body of the world, its figure, qualities, and orderly movement, and also all the bodies which are in it; or whether we consider all life, either that which nourishes and maintains, as the life of trees, or that which, besides this, has also sensation, as the life of beasts; or that which adds to all these intelligence, as the life of man; or that which does not need the support of nutriment, but only maintains, feels, understands, as the life of angels,—all can only be through Him who absolutely is . For to Him it is not one thing to be, and another to live, as though He could be, not living; nor is it to Him one thing to live, and another thing to understand, as though He could live, not understanding; nor is it to Him one thing to understand, another thing to be blessed, as though He could understand and not be blessed. But to Him to live, to understand, to be blessed, are to be. They have understood, from this unchangeableness and this simplicity, that all things must have been made by Him, and that He could Himself have been made by none. For they have considered that whatever is is either body or life, and that life is something better than body, and that the nature of body is sensible, and that of life intelligible. Therefore they have preferred the intelligible nature to the sensible. We mean by sensible things such things as can be perceived by the sight and touch of the body; by intelligible things, such as can be understood by the sight of the mind.
For there is no corporeal beauty, whether in the condition of a body, as figure, or in its movement, as in music, of which it is not the mind that judges. But this could never have been, had there not existed in the mind itself a superior form of these things, without bulk, without noise of voice, without space and time. But even in respect of these things, had the mind not been mutable, it would not have been possible for one to judge better than another with regard to sensible forms. He who is clever, judges better than he who is slow, he who is skilled than he who is unskillful, he who is practised than he who is unpractised; and the same person judges better after he has gained experience than he did before. But that which is capable of more and less is mutable; whence able men, who have thought deeply on these things, have gathered that the first form is not to be found in those things whose form is changeable.
Since, therefore, they saw that body and mind might be more or less beautiful in form, and that, if they wanted form, they could have no existence, they saw that there is some existence in which is the first form, unchangeable, and therefore not admitting of degrees of comparison, and in that they most rightly believed was the first principle of things which was not made, and by which all things were made. Therefore that which is known of God He manifested to them when His invisible things were seen by them, being understood by those things which have been made; also His eternal power and Godhead by whom all visible and temporal things have been created. We have said enough upon that part of theology which they call physical, that is, natural.
Chapter 7.—How Much the Platonists are to Be Held as Excelling Other Philosophers in Logic, i.e. Rational Philosophy.
Then, again, as far as regards the doctrine which treats of that which they call logic, that is, rational philosophy, far be it from us to compare them with those who attributed to the bodily senses the faculty of discriminating truth, and thought, that all we learn is to be measured by their untrustworthy and fallacious rules. Such were the Epicureans, and all of the same school. Such also were the Stoics, who ascribed to the bodily senses that expertness in disputation which they so ardently love, called by them dialectic, asserting that from the senses the mind conceives the notions (ἒννοιαι) of those things which they explicate by definition. And hence is developed the whole plan and connection of their learning and teaching. I often wonder, with respect to this, how they can say that none are beautiful but the wise; for by what bodily sense have they perceived that beauty, by what eyes of the flesh have they seen wisdom’s comeliness of form? Those, however, whom we justly rank before all others, have distinguished those things which are conceived by the mind from those which are perceived by the senses, neither taking away from the senses anything to which they are competent, nor attributing to them anything beyond their competency. And the light of our understandings, by which all things are learned by us, they have affirmed to be that selfsame God by whom all things were made.
Chapter 8.—That the Platonists Hold the First Rank in Moral Philosophy Also.
The remaining part of philosophy is morals, or what is called by the Greeks ἠθική , in which is discussed the question concerning the chief good,—that which will leave us nothing further to seek in order to be blessed, if only we make all our actions refer to it, and seek it not for the sake of something else, but for its own sake. Therefore it is called the end, because we wish other things on account of it, but itself only for its own sake. This beatific good, therefore, according to some, comes to a man from the body, according to others, from the mind, and, according to others, from both together. For they saw that man himself consists of soul and body; and therefore they believed that from either of these two, or from both together, their well-being must proceed, consisting in a certain final good, which could render them blessed, and to which they might refer all their actions, not requiring anything ulterior to which to refer that good itself. This is why those who have added a third kind of good things, which they call extrinsic,—as honor, glory, wealth, and the like,—have not regarded them as part of the final good, that is, to be sought after for their own sake, but as things which are to be sought for the sake of something else, affirming that this kind of good is good to the good, and evil to the evil. Wherefore, whether they have sought the good of man from the mind or from the body, or from both together, it is still only from man they have supposed that it must be sought. But they who have sought it from the body have sought it from the inferior part of man; they who have sought it from the mind, from the superior part; and they who have sought it from both, from the whole man. Whether therefore, they have sought it from any part, or from the whole man, still they have only sought it from man; nor have these differences, being three, given rise only to three dissentient sects of philosophers, but to many. For diverse philosophers have held diverse opinions, both concerning the good of the body, and the good of the mind, and the good of both together.
Let, therefore, all these give place to those philosophers who have not affirmed that a man is blessed by the enjoyment of the body, or by the enjoyment of the mind, but by the enjoyment of God,—enjoying Him, however, not as the mind does the body or itself, or as one friend enjoys another, but as the eye enjoys light, if, indeed, we may draw any comparison between these things. But what the nature of this comparison is, will, if God help me, be shown in another place, to the best of my ability. At present, it is sufficient to mention that Plato determined the final good to be to live according to virtue, and affirmed that he only can attain to virtue who knows and imitates God,—which knowledge and imitation are the only cause of blessedness. Therefore he did not doubt that to philosophize is to love God, whose nature is incorporeal.