Thomas’ unbelief has benefited our faith more than the belief of the other disciples; it is because he attained faith through physical touch that we are confirmed in the faith beyond all doubt. Indeed, the Lord permitted the apostle to doubt after the resurrection; but He did not abandon him in doubt. By his doubt and by his touching the sacred wounds the apostle became a witness to the truth of the resurrection.

Thomas touched and cried out: My Lord and my God! And Jesus said to him: Because you have seen Me, Thomas, you have believed. Now if Thomas saw and touched the Savior, why did Jesus say: Because you have seen Me, Thomas, you have believed? Because he saw something other than what he believed. For no mortal man can see divinity. Thomas saw the Man Christ and acknowledged His divinity with the words: My Lord and my God. Faith therefore followed upon seeing.

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Pope St. Gregory the Great

Homily 26

April 21, 591 AD