I answer that, Christ manifested His Resurrection in two ways: namely, by testimony; and by proof or sign: and each manifestation was sufficient in its own class. For in order to manifest His Resurrection He made use of a double testimony, neither of which can be rebutted. The first of these was the angels' testimony, who announced the Resurrection to the women, as is seen in all the Evangelists: the other was the testimony of the Scriptures, which He set before them to show the truth of the Resurrection, as is narrated in the last chapter of Luke.
Again, the proofs were sufficient for showing that the Resurrection was both true and glorious. That it was a true Resurrection He shows first on the part of the body; and this He shows in three respects; first of all, that it was a true and solid body, and not phantastic or rarefied, like the air. And He establishes this by offering His body to be handled; hence He says in the last chapter of Luke (39): "Handle and see; for a spirit hath not flesh and bones, as you see Me to have." Secondly, He shows that it was a human body, by presenting His true features for them to behold. Thirdly, He shows that it was identically the same body which He had before, by showing them the scars of the wounds; hence, as we read in the last chapter of Luke (39) he said to them: "See My hands and feet, that it is I Myself."
Secondly, He showed them the truth of His Resurrection on the part of His soul reunited with His body: and He showed this by the works of the threefold life. First of all, in the operations of the nutritive life, by eating and drinking with His disciples, as we read in the last chapter of Luke. Secondly, in the works of the sensitive life, by replying to His disciples' questions, and by greeting them when they were in His presence, showing thereby that He both saw and heard; thirdly, in the works of the intellective life by their conversing with Him, and discoursing on the Scriptures. And, in order that nothing might be wanting to make the manifestation complete, He also showed that He had the Divine Nature, by working the miracle of the draught of fishes, and further by ascending into heaven while they were beholding Him: because, according to Jn. 3:13: "No man hath ascended into heaven, but He that descended from heaven, the Son of Man who is in heaven."
He also showed His disciples the glory of His Resurrection by entering in among them when the doors were closed: as Gregory says (Hom. xxvi in Evang.): "Our Lord allowed them to handle His flesh which He had brought through closed doors, to show that His body was of the same nature but of different glory." It likewise was part of the property of glory that "He vanished suddenly from their eyes," as related in the last chapter of Luke; because thereby it was shown that it lay in His power to be seen or not seen; and this belongs to a glorified body, as stated above (Question [54], Article [1], ad 2, Article [2], ad 1).
