Gregory the Great
Catena Aurea · Matthäusevangelium 11
And it came to pass, when Jesus had made an end of commanding his twelve disciples, he departed thence to teach and to preach in their cities. Now when John had heard in the prison the works of Christ, he sent two of his disciples, And said unto him, Art thou he that should come, or do we look for another? Jesus answered and said unto them, Go and shew John again those things which ye do hear and see: The blind receive their sight, and the lame walk, the lepers are cleansed, and the deaf hear, the dead are raised up, and the poor have the Gospel preached to them. And blessed is he, whosoever shall not he offended in me.
(Aug, ubi sup) But this question may be answered in a better way if we attend to the order of time. At the waters of Jordan he had affirmed that this was the Redeemer of the world after he was thrown into prison, he enquires if this was He that should come—not that he doubted that this was the Redeemer of the world, but he asks that he may know whether He who in His own person had come into the world, would in His own person descend also to the world below.