Summary (of Doctrine) Regarding the Father, the Son, and the Holy Spirit, and the Other Topics Discussed in the Preceding Pages.
35 But some one will perhaps inquire whether we can obtain out of Scripture any grounds for such an understanding of the subject. Now I think some such view is indicated in the Psalms, when the prophet says, “My eyes have seen your imperfection;” by which the mind of the prophet, examining with keener glance the first principles of things, and separating in thought and imagination only between matter and its qualities, perceived the imperfection of God, which certainly is understood to be perfected by the addition of qualities. Enoch also, in his book, speaks as follows: “I have walked on even to imperfection;” which expression I consider may be understood in a similar manner, viz., that the mind of the prophet proceeded in its scrutiny and investigation of all visible things, until it arrived at that first beginning in which it beheld imperfect matter (existing) without “qualities.” For it is written in the same boo of Enoch, “I beheld the whole of matter;” which is so understood as if he had said: “I have clearly seen all the divisions of matter which are broken up from one into each individual species either of men, or animals, or of the sky, or of the sun, or of all other things in this world.” After these points, now, we proved to the best of our power in the preceding pages that all things which exist were made by God, and that there was nothing which was not made, save the nature of the Father, and the Son, and the Holy Spirit; and that God, who is by nature good, desiring to have those upon whom He might confer benefits, and who might rejoice in receiving His benefits, created creatures worthy (of this), i.e., who were capable of receiving Him in a worthy manner, who, He says, are also begotten by Him as his sons. He made all things, moreover, by number and measure. For there is nothing before God without either limit or measure. For by His power He comprehends all things, and He Himself is comprehended by the strength of no created thing, because that nature is known to itself alone. For the Father alone knows the Son, and the Son alone knows the Father, and the Holy Spirit alone searches even the deep things of God. All created things, therefore, i.e., either the number of rational beings or the measure of bodily matter, are distinguished by Him as being within a certain number or measurement; since, as it was necessary for an intellectual nature to employ bodies, and this nature is shown to be changeable and convertible by the very condition of its being created (for what did not exist, but began to exist, is said by this very circumstance to be of mutable nature), it can have neither goodness nor wickedness as an essential, but only as an accidental attribute of its being. Seeing, then, as we have said, that rational nature was mutable and changeable, so that it made use of a different bodily covering of this or that sort of quality, according to its merits, it was necessary, as God foreknew there would be diversities in souls or spiritual powers, that He should create also a bodily nature the qualities of which might be changed at the will of the Creator into all that was required. And this bodily nature must last as long as those things which require it as a covering: for there will be always rational natures which need a bodily covering; and there will therefore always be a bodily nature whose coverings must necessarily be used by rational creatures, unless some one be able to demonstrate by arguments that a rational nature can live without a body. But how difficult— nay, how almost impossible— this is for our understanding, we have shown in the preceding pages, in our discussion of the individual topics.
36. It will not, I consider, be opposed to the nature of our undertaking, if we restate with all possible brevity our opinions on the immortality of rational natures. Every one who participates in anything, is unquestionably of one essence and nature with him who is partaker of the same thing. For example, as all eyes participate in the light, so accordingly all eyes which partake of the light are of one nature; but although every eye partakes of the light, yet, inasmuch as one sees more clearly, and another more obscurely, every eye does not equally share in the light. And again, all hearing receives voice or sound, and therefore all hearing is of one nature; but each one hears more rapidly or more slowly, according as the quality of his hearing is clear and sound. Let us pass now from these sensuous illustrations to the consideration of intellectual things. Every mind which partakes of intellectual light ought undoubtedly to be of one nature with every mind which partakes in a similar manner of intellectual light. If the heavenly virtues, then, partake of intellectual light, i.e., of divine nature, because they participate in wisdom and holiness, and if human souls, have partaken of the same light and wisdom, and thus are mutually of one nature and of one essence—then, since the heavenly virtues are incorruptible and immortal, the essence of the human soul will also be immortal and incorruptible. And not only so, but because the nature of Father, and Son, and Holy Spirit, whose intellectual light alone all created things have a share, is incorruptible and eternal, it is altogether consistent and necessary that every substance which partakes of that eternal nature should last for ever, and be incorruptible and eternal, so that the eternity of divine goodness may be understood also in this respect, that they who obtain its benefits are also eternal. But as, in the instances referred to, a diversity in the participation of the light was observed, when the glance of the beholder was described as being duller or more acute, so also a diversity is to be noted in the participation of Father, Son, and Holy Spirit, varying with the degree of zeal or capacity of mind. If such were not the case, we have to consider whether it would not seem to be an act of impiety to say that the mind which is capable of (receiving) God should admit of a destruction of its essence; as if the very fact that it is able to feel and understand God could not suffice for its perpetual existence, especially since, if even through neglect the mind fall away from a pure and complete reception of God, it nevertheless contains within it certain seeds of restoration and renewal to a better understanding, seeing the “inner,” which is also called the “rational” man, is renewed after “the image and likeness of God, who created him.” And therefore the prophet says, “All the ends of the earth shall remember, and turn unto the Lord; and all the kindreds of the nations shall worship before You.”
Source: De Principiis (New Advent)