24 And now do you in your turn answer me these questions. How do you explain the fact that Thomas felt the hands of the risen Lord and beheld His side pierced by the spear? And the fact that Peter saw the Lord standing on the shore and eating a piece of a roasted fish and a honeycomb. If He stood, He must certainly have had feet. If He pointed to His wounded side He must have also had chest and belly for to these the sides are attached and without them they cannot be.
If He spoke, He must have used a tongue and palate and teeth. For as the bow strikes the strings, so to produce vocal sound does the tongue come in contact with the teeth. If His hands were felt, it follows that He must have had arms as well. Since therefore it is admitted that He had all the members which go to make up the body, He must have also had the whole body formed of them, and that not a woman's but a man's; that is to say, He rose again in the sex in which He died. And if you cavil farther and say: We shall eat then, I suppose, after the resurrection; or How can a solid and material body enter in contrary to its nature through closed doors?
You shall receive from me this reply. Do not for this matter of food find fault with belief in the resurrection: for our Lord after raising the daughter of the ruler of the synagogue commanded food to be given her. And Lazarus who had been dead four days is described as sitting at meat with Him, the object in both cases being to show that the resurrection was real and not merely apparent. And if from our Lord's entering in through closed doors you strive to prove that His body was spiritual and aerial, He must have had this spiritual body even before He suffered; since— contrary to the nature of heavy bodies— He was able to walk upon the sea. The apostle Peter also must be believed to have had a spiritual body for he also walked upon the waters with buoyant step. The true explanation is that when anything is done against nature, it is a manifestation of God's might and power.
And to show plainly that in these great signs our attention is asked not to a change in nature but to the almighty power of God, he who by faith had walked on water began to sink for the want of it and would have done so had not the Lord lifted him up with the reproving words, “O thou of little faith wherefore did you doubt?” I wonder that you can display such effrontery when the Lord Himself said, “reach hither your finger, and behold my hands; and reach hither your hand and thrust it into my side: and be not faithless but believing,” and in another place, “behold my hands and my feet that it is I myself: handle me and see; for a spirit has not flesh and bones as you see me have.
And when he had thus spoken he showed them his hands and his feet.” You hear Him speak of bones and flesh, of feet and hands; and yet you want to palm off on me the bubbles and airy nothings of which the stoics rave!
Source: Letters (New Advent)