7 Now this did not come to pass putatively, as some have supposed: far be the thought: but the Saviour having in very truth become Man, the salvation of the whole man was brought about. For if the Word were in the Body putatively, as they say, and by putative is meant imaginary, it follows that both the salvation and the resurrection of man is apparent only, as the most impious Manichæus held. But truly our salvation is not merely apparent, nor does it extend to the body only, but the whole man, body and soul alike, has truly obtained salvation in the Word Himself.
That then which was born of Mary was according to the divine Scriptures human by nature, and the Body of the Lord was a true one; but it was this, because it was the same as our body, for Mary was our sister inasmuch as we all are from Adam. And no one can doubt of this when he remembers what Luke wrote. For after He had risen from the dead, when some thought that they did not see the Lord in the body derived from Mary, but were beholding a spirit instead, He said, 'See My hands and My feet, and the prints of the nails, that it is I Myself: handle Me and see; for a spirit has not flesh and bones as you see Me to have.
And when He had said thus, He showed them His hands and His feet.' Whence they can be refuted who have ventured to say that the Lord was transformed into flesh and bones. For He did not say, 'As you see Me to be flesh and bone,' but 'as you see Me to have,' in order that it might not be thought that the Word Himself was changed into these things, but that He might be believed to have them after His resurrection as well as before His death.
Source: Letters (New Advent)