For my part, in view of the difficulties of the subject proposed, I think the exclamation of the Apostle very suitable to the present case, just as he uttered it over unfathomable questions: “O the depth of the riches both of the wisdom and knowledge of God! How unsearchable are His judgments, and His ways past finding out! For who has known the mind of the Lord?” But seeing on the other hand that that Apostle declares it to be a peculiarity of him that is spiritual to “judge all things,” and commends those who have been “enriched” by the Divine grace “in all utterance and in all knowledge,” I venture to assert that it is not right to omit the examination which is within the range of our ability, nor to leave the question here raised without making any inquiries, or having any ideas about it; lest, like the actual subject of our proposed discussion, this essay should have an ineffectual ending, spoilt before its maturity by the fatal indolence of those who will not nerve themselves to search out the truth, like a new-born infant ere it sees the light and acquires any strength.
I assert, too, that it is not well at once to confront and meet objections, as if we were pleading in court, but to introduce a certain order into the discussion and to lead the view on from one point to another. What, then, should this order be? First, we want to know the whence of human nature, and the wherefore of its ever having come into existence. If we hit the answer to these questions, we shall not fail in getting the required explanation. Now, that everything that exists, after God, in the intellectual or sensible world of beings owes that existence to Him, is a proposition which it is superfluous to prove; no one, with however little insight into the truth of things, would gainsay it.
For every one agrees that the Universe is linked to one First Cause; that nothing in it owes its existence to itself, so as to be its own origin and cause; but that there is on the other hand a single uncreate eternal Essence, the same for ever, which transcends all our ideas of distance, conceived of as without increase or decrease, and beyond the scope of any definition; and that time and space with all their consequences, and anything previous to these that thought can grasp in the intelligible supramundane world, are all the productions of this Essence.
Well, then, we affirm that human nature is one of these productions; and a word of the inspired Teaching helps us in this, which declares that when God had brought all things else upon the scene of life, man was exhibited upon the earth, a mixture from Divine sources, the godlike intellectual essence being in him united with the several portions of earthly elements contributed towards his formation, and that he was fashioned by his Maker to be the incarnate likeness of Divine transcendent Power.
It would be better however to quote the very words: “And God created man, in the image of God created He him.” Now the reason of the making of this animate being has been given by certain writers previous to us as follows. The whole creation is divided into two parts; that “which is seen,” and that “which is not seen,” to use the Apostle's words (the second meaning the intelligible and immaterial, the first, the sensible and material); and being thus divided, the angelic and spiritual natures, which are among “the things not seen,” reside in places above the world, and above the heavens, because such a residence is in correspondence with their constitution; for an intellectual nature is a fine, clear, unencumbered, agile kind of thing, and a heavenly body is fine and light, and perpetually moving, and the earth on the contrary, which stands last in the list of things sensible, can never be an adequate and congenial spot for creatures intellectual to sojourn in.
For what correspondence can there possibly be between that which is light and buoyant, on the one hand, and that which is heavy and gravitating on the other? Well, in order that the earth may not be completely devoid of the local indwelling of the intellectual and the immaterial, man (these writers tell us) was fashioned by the Supreme forethought, and his earthy parts moulded over the intellectual and godlike essence of his soul; and so this amalgamation with that which has material weight enables the soul to live on this element of earth, which possesses a certain bond of kindred with the substance of the flesh.
The design of all that is being born, then, is that the Power which is above both the heavenly and the earthly universe may in all parts of the creation be glorified by means of intellectual natures, conspiring to the same end by virtue of the same faculty in operation in all, I mean that of looking upon God. But this operation of looking upon God is nothing less than the life-nourishment appropriate, as like to like, to an intellectual nature. For just as these bodies, earthy as they are, are preserved by nourishment that is earthy, and we detect in them all alike, whether brute or reasoning, the operations of a material kind of vitality, so it is right to assume that there is an intellectual life-nourishment as well, by which such natures are maintained in existence.
But if bodily food, coming and going as it does in circulation, nevertheless imparts a certain amount of vital energy to those who get it, how much more does the partaking of the real thing, always remaining and always the same, preserve the eater in existence? If, then, this is the life-nourishment of an intellectual nature, namely, to have a part in God, this part will not be gained by that which is of an opposite quality; the would-be partaker must in some degree be akin to that which is to be partaken of.
The eye enjoys the light by virtue of having light within itself to seize its kindred light, and the finger or any other limb cannot effect the act of vision because none of this natural light is organized in any of them. The same necessity requires that in our partaking of God there should be some kinship in the constitution of the partaker with that which is partaken of. Therefore, as the Scripture says, man was made in the image of God; that like, I take it, might be able to see like; and to see God is, as was said above, the life of the soul.
But seeing that ignorance of the true good is like a mist that obscures the visual keenness of the soul, and that when that mist grows denser a cloud is formed so thick that Truth's ray cannot pierce through these depths of ignorance, it follows further that with the total deprivation of the light the soul's life ceases altogether; for we have said that the real life of the soul is acted out in partaking of the Good; but when ignorance hinders this apprehension of God, the soul which thus ceases to partake of God, ceases also to live.
But no one can force us to give the family history of this ignorance, asking whence and from what father it is; let him be given to understand from the word itself that “ignorance” and “knowledge” indicate one of the relations of the soul; but no relation, whether expressed or not, conveys the idea of substance; a relation and a substance are quite of different descriptions. If, then, knowledge is not a substance, but a perfected operation of the soul, it must be conceded that ignorance must be much farther removed still from anything in the way of substance; but that which is not in that way does not exist at all; and so it would be useless to trouble ourselves about where it comes from.
Now seeing that the Word declares that the living in God is the life of the soul, and seeing that this living is knowledge according to each man's ability, and that ignorance does not imply the reality of anything, but is only the negation of the operation of knowing, and seeing that upon this partaking in God being no longer effected there follows at once the cancelling of the soul's life, which is the worst of evils—because of all this the Producer of all Good would work in us the cure of such an evil.
A cure is a good thing, but one who does not look to the evangelic mystery would still be ignorant of the manner of the cure. We have shown that alienation from God, Who is the Life, is an evil; the cure, then, of this infirmity is, again to be made friends with God, and so to be in life once more. When such a life, then, is always held up in hope before humanity, it cannot be said that the winning of this life is absolutely a reward of a good life, and that the contrary is a punishment (of a bad one); but what we insist on resembles the case of the eyes.
We do not say that one who has clear eyesight is rewarded as with a prize by being able to perceive the objects of sight; nor on the other hand that he who has diseased eyes experiences a failure of optic activity as the result of some penal sentence. With the eye in a natural state sight follows necessarily; with it vitiated by disease failure of sight as necessarily follows. In the same way the life of blessedness is as a familiar second nature to those who have kept clear the senses of the soul; but when the blinding stream of ignorance prevents our partaking in the real light, then it necessarily follows that we miss that, the enjoyment of which we declare to be the life of the partaker.
Source: On Infants' Early Deaths (New Advent)