And Jesus, when he was baptized, went up immediately out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:
All Commentaries on Matthew 3:16 Go To Matthew 3
Theophylact of Ochrid
AD 1107
He was baptized at the age of thirty; for by this age one has experienced all the sins. In the first ten years, there is great foolishness; in the second, during adolescence, the great flame of desire and anger; and in the years of adulthood, great avarice. Jesus waited for this age, therefore, so that He could fulfill the law in all the ages of a man, and sanctify us.
The Manichean heretics say that He left His body in the Jordan and thereafter displayed another, illusory, body. But their mouths are shut by this, for it says, "Jesus went up"; it was not another who went up, but He Who went down into the water.
Adam had closed the heavens, but through Christ they are opened, so that you may learn, O reader, that when you are baptized, you, too, open the heavens.