Thomas Aquinas

“ We may also reply that the form of other things subject to generation and corruption is not subsistent of itself, so as to be able to remain after the corruption of the composite, as it is with the rational soul. For the soul, even after separation from the body, retains the being which accrues to it when in the body, and the body is made to share that being by the resurrection, since the being of the body and the being of the soul in the body are not distinct from one another, otherwise the union of soul and body would be accidental. ”

“ First, because human nature which is the form of the whole is not both form and substance as the soul is, but is a form only. Now such like forms pass away into complete nonentity, and consequently they cannot be restored. Secondly, because human nature results from union of parts. Now the same identical union as that which was heretofore cannot be resumed, because repetition is opposed to identity, since repetition implies number, whereas identity implies unity, and these are incompatible with one another. ”

“ Further, to every form some matter is adapted according to its condition, and likewise to every agent some instrument. Now the body is compared to the soul as matter to form, and as instrument to agent. Since then at the resurrection the soul will not be of the same condition as now (for it will be either entirely borne away to the heavenly life to which it adhered while living in the world, or will be cast down into the life of the brutes if it lived as a brute in this world) it would seem that it will not resume the same body, but either a heavenly or a brutish body. ”

“ Nevertheless neither does the self-same man recur by natural generation, because the body of the man begotten is not composed of the whole body of his begetter: hence his body is numerically distinct, and consequently his soul and the whole man. ”

“ But resurrection is a repeated union: therefore the union is not the same, and consequently there is not the same human nature nor the same man.
Objection 3: Further, one same man is not several animals: wherefore if it is not the same animal it is not the same identical man. Now where sense is not the same, there is not the same animal, since animal is defined from the primary sense, namely touch. ”

“ Consequently there has been no interruption in the substantial being of man, as would make it impossible for the self-same man to return on account of an interruption in his being, as is the case with other things that are corrupted, the being of which is interrupted altogether, since their form remains not, and their matter remains under another being. ”

“ Hence it was possible for them to maintain that the soul pre-existed before being infused into the body begotten of natural generation, as also that it is united to various bodies. The second is that they held intellect not to differ from sense except accidentally, so that man would be said to surpass other animals in intelligence, because the sensitive power is more acute in him on account of the excellence of his bodily complexion ”

“ And since it behooves the end to be obtained by the selfsame thing that was made for that end, lest it appear to be made without purpose, it is necessary for the selfsame man to rise again; and this is effected by the selfsame soul being united to the selfsame body. For otherwise there would be no resurrection properly speaking, if the same man were not reformed. Hence to maintain that he who rises again is not the selfsame man is heretical, since it is contrary to the truth of Scripture which proclaims the resurrection. ”

“ The Philosopher is speaking of repetition by movement or natural change. For he shows the difference between the recurrence that occurs in generation and corruption and that which is observed in the movement of the heavens. ”