Of the Creation of Man, and of the Arrangement of the World, and of the Chief Good
Let us now assign the reason why He made man himself. For if the philosophers had known this, they would either have maintained those things which they had found to be true, or would not have fallen into the greatest errors. For this is the chief thing; this is the point on which everything turns. And if any one does not possess this, the truth altogether glides away from him. It is this, in short, which causes them to be inconsistent with reason; for if this had shone upon them, if they had known all the mystery of man, the Academy would never have been in entire opposition to their disputations, and to all philosophy. As, therefore, God did not make the world for His own sake, because He does not stand in need of its advantages, but for the sake of man, who has the use of it, so also He made man himself for His own sake. What advantage is there to God in man, says Epicurus, that He should make him for His own sake? Truly, that there might be one who might understand His works; who might be able both to admire with his understanding, and to express with his voice, the foresight displayed in their arrangement, the order of their creation, the power exerted in their completion. And the sum of all these things is, that he should worship God. For he who understands these things worships Him; he follows Him with due veneration as the Maker of all things, He as his true Father, who measures the excellence of His majesty according to the invention, the commencement, and completion of His works. What more evident argument can be brought forward that God both made the world for the sake of man, and man for His own sake, than that he alone of all living creatures has been so formed that his eyes are directed towards heaven, his face looking towards God, his countenance is in fellowship with his Parent, so that God appears, as it were, with outstretched hand to have raised man from the ground, and to have elevated him to the contemplation of Himself. “What, then,” he says, “does the worship paid by man confer on God, who is blessed, and in want of nothing? Or if He gave such honour to man as to create the world for his sake, to furnish him with wisdom, to make him lord of all things living, and to love him as a son, why did He make him subject to death and decay? Why did He expose the object of His love to all evils? When it was befitting that man should be happy, as though closely connected with God, and everlasting as He is, to the worship and contemplation of whom he was formed.”
Although we have taught these things for the most part in a scattered manner in the former books, nevertheless, since the subject now specially requires it, because we have undertaken to discuss the subject of a happy life, these things are to be explained by us more carefully and fully, that the arrangement made by God, and His work and will, may be known. Though He was always able by His own immortal Spirit to produce innumerable souls, as He produced the angels, to whom there exists immortality without any danger and fear of evils, yet He devised an unspeakable work, in what manner He might create an infinite multitude of souls, which being at first united with frail and feeble bodies, He might place in the midst between good and evil, that He might set virtue before them composed as they were of both natures; that they might not attain to immortality by a delicate and easy course of life, but might arrive at that unspeakable reward of eternal life with the utmost difficulty and great labours. Therefore, that He might clothe them with limbs which were heavy and liable to injury, since they were unable to exist in the middle void, the weight and gravity of the body sinking downwards, He determined that an abode and dwelling-place should first be built for them. And thus with unspeakable energy and power He contrived the surpassing works of the world; and having suspended the light elements on high, and depressed the heavy ones to the depths below, He strengthened the heavenly things, and established the earthly. It is not necessary at present to follow out each point separately, since we discussed them all together in the second book.
Therefore He placed in the heaven lights, whose regularity, and brightness, and motion, were most suitably proportioned to the advantage of living beings. Moreover, He gave to the earth, which He designed as their dwelling-place, fruitfulness for bringing forth and producing various things, that by the abundance of fruits and green herbs it might supply nourishment according to the nature and requirements of each kind. Then, when He had completed all things which belonged to the condition of the world, He formed man from the earth itself, which He prepared for him from the beginning as a habitation; that is, He clothed and covered his spirit with an earthly body, that, being compacted of different and opposing materials, he might be susceptible of good and evil; and as the earth itself is fruitful for the bringing forth of grain, so the body of man, which was taken from the earth, received the power of producing offspring, that, inasmuch as he was formed of a fragile substance, and could not exist for ever, when the space of his temporal life was past, he might depart, and by a perpetual succession renew that which he bore, which was frail and feeble. Why, then, did He make him frail and mortal, when He had built the world for his sake? First of all, that an infinite number of living beings might be produced, and that He might fill all the earth with a multitude; in the next place, that He might set before man virtue, that is, endurance of evils and labours, by which he might be able to gain the reward of immortality. For since man consists of two parts, body and soul, of which the one is earthly, the other heavenly, two lives have been assigned to man: the one temporal, which is appointed for the body; the other everlasting, which belongs to the soul. We received the former at our birth we attain to the latter by striving, that immortality might not exist to man without any difficulty. That earthly one is as the body, and therefore has an end; but this heavenly one is as the soul, and therefore has no limit. We received the first when we were ignorant of it, this second knowingly; for it is given to virtue, not to nature, because God wished that we should procure life for ourselves in life.
For this reason He has given us this present life, that we may either lose that true and eternal life by our vices, or win it by virtue. The chief good is not contained in this bodily life, since, as it was given to us by divine necessity, so it will again be destroyed by divine necessity. Thus that which has an end does not contain the chief good. But the chief good is contained in that spiritual life which we acquire by ourselves, because it cannot contain evil, or have an end; to which subject nature and the system of the body afford an argument. For other animals incline towards the ground, because they are earthly, and are incapable of immortality, which is from heaven; but man is upright and looks towards heaven, because immortality is proposed to him; which, however, does not come, unless it is given to man by God. For otherwise there would be no difference between the just and the unjust, since every man who is born would become immortal. Immortality, then, is not the consequence of nature, but the reward and recompense of virtue. Lastly, man does not immediately upon his birth walk upright, but at first on all fours, because the nature of his body and of this present life is common to us with the dumb animals; afterwards, when his strength is confirmed, he raises himself, and his tongue is loosened so that he speaks plainly, and he ceases to be a dumb animal. And this argument teaches that man is born mortal; but that he afterwards becomes immortal, when he begins to live in conformity with the will of God, that is, to follow righteousness, which is comprised in the worship of God, since God raised man to a view of the heaven and of Himself. And this takes place when man, purified in the heavenly laver, lays aside his infancy together with all the pollution of his past life, and having received an increase of divine vigour, becomes a perfect and complete man.
Source: The Divine Institutes (New Advent)