6 Let us again call to mind whence this discourse started. It was when that man who was thirty-eight years in infirmity was healed, and Jesus commanded him, now made whole, to take up his bed and to go to his house. For this cause, indeed, the Jews with whom He was speaking were enraged. He spoke in words, as to the meaning He was silent; hinted in some measure at the meaning to those who understood, and hid the matter from them that were angry. For this cause, I say, the Jews, being enraged because the Lord did this on the Sabbath, gave occasion to this discourse.
Therefore let us not hear these things in such wise as if we had forgotten what was said above, but let us look back to that impotent man languishing for thirty-eight years suddenly made whole, while the Jews marvelled and were angry. They sought darkness from the Sabbath more than light from the miracle. Speaking then to these, while they are indignant, He says, “Greater works than these will He show Him.” “Greater than these:” than which? What you have seen, that a man, whose infirmity had lasted thirty-eight years, was made whole; greater than these the Father is about to show to the Son.
What are greater works? He goes on, saying, “For as the Father raises the dead, and quickens them, so also the Son quickens whom He will.” Clearly these are greater. Very much greater is it that a dead man should rise, than that a sick man should recover: these are greater. But when is the Father about to show these to the Son? Does the Son not know them? And He who was speaking, did He not know how to raise the dead? Had He yet to learn how to raise the dead to life— He, I say, by whom all things were made? He who caused that we should live, when we were not in being, had He yet to learn how we might be raised to life again? What, then, do His words mean?
Source: Tractates on the Gospel of John (New Advent)