Thomas Aquinas

“ First, because man is taught by it not to prefer the devil to himself, nor to honor him who is the author of sin; hence Augustine says (De Trin. xiii, 17) : "Since human nature is so united to God as to become one person, let not these proud spirits dare to prefer themselves to man, because they have no bodies." Secondly, because we are thereby taught how great is man's dignity, lest we should sully it with sin; hence Augustine says (De Vera Relig. xvi) : "God has proved to us how high a place human nature holds amongst creatures, inasmuch as He appeared to men as a true man." ”

“ Weakness is assumed by strength, lowliness by majesty, mortality by eternity, in order that one and the same Mediator of God and men might die in one and rise in the other – for this was our fitting remedy. Unless He was God, He would not have brought a remedy; and unless He was man, He would not have set an example. ”

“ The mystery of the Incarnation was not completed through God being changed in any way from the state in which He had been from eternity, but through His having united Himself to the creature in a new way, or rather through having united it to Himself. But it is fitting that a creature which by nature is mutable, should not always be in one way. ”

“ To be united to God in unity of person was not fitting to human flesh, according to its natural endowments, since it was above its dignity; nevertheless, it was fitting that God, by reason of His infinite goodness, should unite it to Himself for man's salvation.
Reply to Objection 3: Every mode of being wherein any creature whatsoever differs from the Creator has been established by God's wisdom, and is ordained to God's goodness. For God, Who is uncreated, immutable, and incorporeal, produced mutable and corporeal creatures for His own goodness. ”

“ Further, for the restoration of human nature, which had fallen through sin, nothing more is required than that man should satisfy for sin. Now man can satisfy, as it would seem, for sin; for God cannot require from man more than man can do, and since He is more inclined to be merciful than to punish, as He lays the act of sin to man's charge, so He ought to credit him with the contrary act. ”

“ Perfection is prior to imperfection, both in time and nature, in things that are different (for what brings others to perfection must itself be perfect) ; but in one and the same, imperfection is prior in time though posterior in nature. And thus the eternal perfection of God precedes in duration the imperfection of human nature; but the latter's ultimate perfection in union with God follows.
Art. 6 - Whether the Incarnation ought to have been put off till the end of the world? Objection 1: It would seem that the work of the Incarnation ought to have been put off till the end of the world. ”

“ And hence, although a man ought to account Christ's gifts as given to himself, yet he ought not to consider them not to be given to others. And thus we do not exclude that He came to wipe away the sin of the whole nature rather than the sin of one person. But the sin of the nature is as perfectly healed in each one as if it were healed in him alone. Hence, on account of the union of charity, what is vouchsafed to all ought to be accounted his own by each one.
Art. 5 - Whether it was fitting that God should become incarnate in the beginning of the human race? ”

“ Charity does not put off bringing assistance to a friend: always bearing in mind the circumstances as well as the state of the persons. For if the physician were to give the medicine at the very outset of the ailment, it would do less good, and would hurt rather than benefit. And hence the Lord did not bestow upon the human race the remedy of the Incarnation in the beginning, lest they should despise it through pride, if they did not already recognize their disease. ”

“ Predestination presupposes the foreknowledge of future things; and hence, as God predestines the salvation of anyone to be brought about by the prayers of others, so also He predestined the work of the Incarnation to be the remedy of human sin. ”

“ Augustine says (Tract. ii) : "Flesh had blinded thee, flesh heals thee; for Christ came and overthrew the vices of the flesh."
Reply to Objection 2: The infinity of Divine power is shown in the mode of production of things from nothing. Again, it suffices for the perfection of the universe that the creature be ordained in a natural manner to God as to an end. But that a creature should be united to God in person exceeds the limits of the perfection of nature. ”

“ A double capability may be remarked in human nature: one, in respect of the order of natural power, and this is always fulfilled by God, Who apportions to each according to its natural capability; the other in respect to the order of the Divine power, which all creatures implicitly obey ”

“ In another way a thing is said to be greater "extensively," as whiteness on a greater superficies is said to be greater; and in this way original sin, whereby the whole human race is infected, is greater than any actual sin, which is proper to one person. ”

“ In the future award the pain of sense will not be meted out to original sin. Yet the penalties, such as hunger, thirst, death, and the like, which we suffer sensibly in this life flow from original sin. And hence Christ, in order to satisfy fully for original sin, wished to suffer sensible pain, that He might consume death and the like in Himself. ”

“ Objection 4: Further, it is not becoming that He Who surpassed the greatest things should be contained in the least, and He upon Whom rests the care of great things should leave them for lesser things. ”

“ I answer that, There are different opinions about this question. For some say that even if man had not sinned, the Son of Man would have become incarnate. Others assert the contrary, and seemingly our assent ought rather to be given to this opinion. ”