On the Incarnation of Christ
1 It is now time, after this cursory notice of these points, to resume our investigation of the incarnation of our Lord and Saviour, viz., how or why He became man. Having therefore, to the best of our feeble ability, considered His divine nature from the contemplation of His own works rather than from our own feelings, and having nevertheless beheld (with the eye) His visible creation while the invisible creation is seen by faith, because human frailty can neither see all things with the bodily eye nor comprehend them by reason, seeing we men are weaker and frailer than any other rational beings (for those which are in heaven, or are supposed to exist above the heaven, are superior), it remains that we seek a being intermediate between all created things and God, i.e., a Mediator, whom the Apostle Paul styles the “first-born of every creature.” Seeing, moreover, those declarations regarding His majesty which are contained in holy Scripture, that He is called the “image of the invisible God, and the first-born of every creature,” and that “in Him were all things created, visible and invisible, whether they be thrones, or dominions, or principalities, or powers, all things were created by Him, and in Him: and He is before all things, and by Him all things consist,” who is the head of all things, alone having as head God the Father; for it is written, “The head of Christ is God;” seeing clearly also that it is written, “No one knows the Father, save the Son, nor does any one know the Son, save the Father” (for who can know what wisdom is, save He who called it into being? Or, who can understand clearly what truth is, save the Father of truth? Who can investigate with certainty the universal nature of His Word, and of God Himself, which nature proceeds from God, except God alone, with whom the Word was), we ought to regard it as certain that this Word, or Reason (if it is to be so termed), this Wisdom, this Truth, is known to no other than the Father only; and of Him it is written, that “I do not think that the world itself could contain the books which might be written,” regarding, viz., the glory and majesty of the Son of God. For it is impossible to commit to writing (all) those particulars which belong to the glory of the Saviour. After the consideration of questions of such importance concerning the being of the Son of God, we are lost in the deepest amazement that such a nature, pre-eminent above all others, should have divested itself of its condition of majesty and become man, and tabernacled among men, as the grace that was poured upon His lips testifies, and as His heavenly Father bore Him witness, and as is confessed by the various signs and wonders and miracles that were performed by Him; who also, before that appearance of His which He manifested in the body, sent the prophets as His forerunners, and the messengers of His advent; and after His ascension into heaven, made His holy apostles, men ignorant and unlearned, taken from the ranks of tax-gatherers or fishermen, but who were filled with the power of His divinity, to itinerate throughout the world, that they might gather together out of every race and every nation a multitude of devout believers in Himself.
2. But of all the marvellous and mighty acts related of Him, this altogether surpasses human admiration, and is beyond the power of mortal frailness to understand or feel, how that mighty power of divine majesty, that very Word of the Father, and that very wisdom of God, in which were created all things, visible and invisible, can be believed to have existed within the limits of that man who appeared in Judea; nay, that the Wisdom of God can have entered the womb of a woman, and have been born an infant, and have uttered wailings like the cries of little children! And that afterwards it should be related that He was greatly troubled in death, saying, as He Himself declared, “My soul is sorrowful even unto death;” and that at the last He was brought to that death which is accounted the most shameful among men, although He rose again on the third day. Since, then, we see in Him some things so human that they appear to differ in no respect from the common frailty of mortals, and some things so divine that they can appropriately belong to nothing else than to the primal and ineffable nature of Deity, the narrowness of human understanding can find no outlet; but, overcome with the amazement of a mighty admiration, knows not whither to withdraw, or what to take hold of, or whither to turn. If it think of a God, it sees a mortal; if it think of a man, it beholds Him returning from the grave, after overthrowing the empire of death, laden with its spoils. And therefore the spectacle is to be contemplated with all fear and reverence, that the truth of both natures may be clearly shown to exist in one and the same Being; so that nothing unworthy or unbecoming may be perceived in that divine and ineffable substance, nor yet those things which were done be supposed to be the illusions of imaginary appearances. To utter these things in human ears, and to explain them in words, far surpasses the powers either of our rank, or of our intellect and language. I think that it surpasses the power even of the holy apostles; nay, the explanation of that mystery may perhaps be beyond the grasp of the entire creation of celestial powers. Regarding Him, then, we shall state, in the fewest possible words, the contents of our creed rather than the assertions which human reason is wont to advance; and this from no spirit of rashness, but as called for by the nature of our arrangement, laying before you rather (what may be termed) our suspicions than any clear affirmations.
Source: De Principiis (New Advent)