John Chrysostom
From this we learn that God does not anticipate our desires with His gifts. But when we begin and show desire, then He provides us with many means of salvation. "What do you seek?" What does this mean? Is He who knows human hearts, who penetrates our thoughts, asking? He asks not in order to learn, for how could that be? He asks in order by the question to draw them nearer to Himself, to give them greater boldness, and to show that they are worthy to speak with Him. They were probably ashamed and afraid, as men unacquainted with Him who had only heard their teacher's testimony about Him. In order to remove all this, their shame and fear, He Himself questions them. He does not leave them to go in silence all the way to His dwelling.
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Perhaps the same would have happened even if He had not asked the question. They would not have ceased following Him and would have come by His footsteps to His dwelling. Why then does He ask them? As I have said, to calm their troubled and unsettled heart and to inspire them with boldness. Meanwhile they expressed their devotion to Christ not only by following Him, but also in the question itself. Though they were not yet His disciples and had heard nothing from Him, they already call Him Teacher. They number themselves among His disciples and show why they followed Him: they wished to hear from Him something profitable. Notice also their good sense. They did not say: teach us doctrines, or something else necessary. What did they say? "Where do You dwell?" As I said above, they wished to speak with Him privately about something, to listen to Him, and to learn from Him. Therefore they do not postpone their intention. They do not say: we will come tomorrow and hear You when You speak in the gathering of the people. Instead they show all their zeal for hearing, so that not even the hour deters them.