Here, found the St. Gregory - St. Macrina dialogue in English, and here's this passage about bodies (with comments), http://www.ccel.org/ccel/schaff/npnf205.x.iii.ii.html
First let us get a clear notion as to the scope of this doctrine; in other words, what is the end that Holy Scripture has in view in promulgating it and creating the belief in it. Well, to sketch the outline of so vast a truth and to embrace it in a definition, we will say that the Resurrection is “the reconstitution of our nature in its original form
[Comment: The actual language of this definition is Platonic (cf. Sympos. p. 193 D), but it is Gregory’s constant formula for the Christian Resurrection;
see De Hom. Opif. c. 17; In Ecclesiast. I. p. 385 A; Funeral Oration for Pulcheria, III. p. 523 C; Orat. de Mortuis, III. p. 632 C; De Virginitate, c. xii. p. 358..” ]
But in that form of life, of which God Himself was the Creator, it is reasonable to believe that there was neither age nor infancy nor any of the sufferings arising from our present various infirmities, nor any kind of bodily affliction whatever. It is reasonable, I say, to believe that God was the Creator of none of these things, but that man was a thing divine before his humanity got within reach of the assault of evil; that then, however, with the inroad of evil, all these afflictions also broke in upon him. Accordingly a life that is free from evil is under no necessity whatever of being passed amidst the things that result from evil. It follows that when a man travels through ice he must get his body chilled; or when he walks in a very hot sun that he must get his skin darkened; but if he has kept clear of the one or the other, he escapes these results entirely, both the darkening and the chilling; no one, in fact, when a particular cause was removed, would be justified in looking for the effect of that particular cause. Just so our nature, becoming passional, had to encounter all the necessary results of a life of passion: but when it shall have started back to that state of passionless blessedness, it will no longer encounter the inevitable results of evil tendencies.
Seeing, then, that all the infusions of the life of the brute into our nature were not in us before our humanity descended through the touch of evil into passions, most certainly, when we abandon those passions, we shall abandon all their visible results. No one, therefore, will be justified in seeking in that other life for the consequences in us of any passion. Just as if a man, who, clad in a ragged tunic, has divested himself of the garb, feels no 124more its disgrace upon him, so we too, when we have cast off that dead unsightly tunic made from the skins of brutes and put upon us (for I take the “coats of skins” to mean that conformation belonging to a brute nature with which we were clothed when we became familiar with passionate indulgence), shall, along with the casting off of that tunic, fling from us all the belongings that were round us of that skin of a brute; and such accretions are sexual intercourse, conception, parturition, impurities, suckling, feeding, evacuation, gradual growth to full size, prime of life, old age, disease, and death. If that skin is no longer round us, how can its resulting consequences be left behind within us?
It is folly, then, when we are to expect a different state of things in the life to come, to object to the doctrine of the Resurrection on the ground of something that has nothing to do with it. I mean, what has thinness or corpulence, a state of consumption or of plethora, or any other condition supervening in a nature that is ever in a flux, to do with the other life, stranger as it is to any fleeting and transitory passing such as that? One thing, and one thing only, is required for the operation of the Resurrection; viz. that a man should have lived, by being born; or, to use rather the Gospel words, that “a man should be born
[Comment: ἐγεννηθη. S. John xvi. 21]
into the world”; the length or briefness of the life, the manner, this or that, of the death, is an irrelevant subject of inquiry in connection with that operation. Whatever instance we take, howsoever we suppose this to have been, it is all the same; from these differences in life there arises no difficulty, any more than any facility, with regard to the Resurrection. He who has once begun to live must necessarily go on having once lived
[Comment: τὸν γὰρ τοῦ ζῆν ἀρξάμενον, ζῆσαι χρὴ πάντως. The present infinitive here expresses only a new state of existence, the aorist a continued act. The aorist may have this force, if (as a whole) it is viewed as a single event in past time. Cf. Appian. Bell. Civ. ii. 91, ἦλθον, εἶδον, ἐνίκησα.]
after his intervening dissolution in death has been repaired in the Resurrection."