1 The Lord appeared to His disciples after His resurrection, as you have heard, and saluted them, saying, “Peace be unto you.” This is peace indeed, and the salutation of salvation: for the very word salutation has received its name from salvation. And what can be better than that Salvation Itself should salute man? For Christ is our Salvation. He is our Salvation, who was wounded for us, and fixed by nails to the tree, and being taken down from the tree, was laid in the sepulchre.
And from the sepulchre He arose, with His wounds healed, His scars kept. For this He judged expedient for His disciples, that His scars should be kept, where by the wounds of their hearts might be healed. What wounds? The wounds of unbelief. For He appeared to their eyes, exhibiting real flesh, and they thought they saw a spirit. It is no light wound, this wound of the heart. Yea, they have made a malignant heresy who have abided in this wound. But do we suppose that the disciples had not been wounded, because they were so quickly healed?
Only, Beloved, suppose, if they had continued in this wound, to think that the Body which had been buried, could not rise again, but that a spirit in the image of a body, deceived the eyes of men: if they had continued in this belief, yea, rather in this unbelief, not their wounds, but their death would have had to be bewailed.
Source: Sermons on Selected Lessons of the New Testament (New Advent)