24 Now Thomas, called the Twin, one of the twelve, was not with them when Jesus came.
25 The other disciples therefore said to him, "We have seen the Lord."So he said to them, "Unless I see in His hands the print of the nails, and put my finger into the print of the nails, and put my hand into His side, I will not believe."
26 And after eight days His disciples were again inside, and Thomas with them. Jesus came, the doors being shut, and stood in the midst, and said, "Peace to you!"
27 Then He said to Thomas, "Reach your finger here, and look at My hands; and reach your hand here, and put it into My side. Do not be unbelieving, but believing."
28 And Thomas answered and said to Him, "My Lord and my God!"
29 Jesus said to him, "Thomas, because you have seen Me, you have believed. Blessed are those who have not seen and yet have believed."
The disciples first opportunity to witness to the risen Christ was to Thomas (v. 25). It was a failure. He did not believe.
nails (v. 25) — This is the only New Testament reference to the nails. (Some crucified persons were tied to the cross.) This fulfills Psalm 22:16.
Jesus' words to Thomas (v. 27) show that He was aware of what Thomas had said earlier. This shows His omniscience.
My God (v. 28) — This is the only place in the Gospels where Jesus was addressed directly as God.
"Jesus saith unto him, Thomas, because thou has seen Me, thou hast believed. Blessed are they that have not seen, and yet have believed." These were His words to adoring Thomas. Here we must consider, in explanation of these words, the dispensational aspect of the occurrence. Thomas is a type of the Jews in our days, who have cast off every bit of the faith of their fathers, but of that remnant which is coming to the foreground during the last years of the present age. Like Thomas, they are still unbelieving; they know Him not who is risen from among the dead and who is the King of Israel. They, too, like Thomas, want to see first, before believing. It is constitutional with the Jew that he asks for a sign, and does not want to believe till he sees. As it was with Thomas, the Lord appeared the second time, so will He appear the second time unto them that look for Him (this expecting Jewish remnant) unto salvation. When He comes again, He will, as it was with Thomas, display the nail prints in His hands and feet and His pierced side, so that it might be fulfilled "They shall look upon Me whom they pierced, and they shall mourn for Him," for they learn then that He was wounded in the house of His friends, wounded for their transgressions and bruised for their iniquities. And, like Thomas, they will cry out "My Lord and My God." Thus they will confess Him, when He comes for their final deliverance, their restoration and spiritual blessing.
"Lo, this is our God, we have waited for Him, and He will save us. This is Jehovah, we have waited for Him, we will be glad, and rejoice in His salvation" (Isaiah 25:9).
When our Lord said "Blessed are they that have not seen and yet have believed," He did not mean the Old Testament saints, but He meant the believers from among the Gentiles, gathered into the Body of Christ during this age. This is the age of faith and not of sight. We, who love Him, though we have never seen Him, and rejoice in Him with joy unspeakable and full of glory, have a greater blessedness, than the Jew who will see Him in the day of His visible coming, and then believe. — The Gospel of John, by Arno Clemens Gaebelein, page 400-401