John Chrysostom
We must here remark, that this word, Fac, signifies a command given to a servant. So God when He wished to create man, said not to the Only-begotten, “Make man,” but, Let us make man, that by the form of unity in the words he might make manifest the equality of the agents. Because then the centurion considered in Christ the greatness of His dominion, therefore saith He, say in a word. For I also say to my servant. But Christ blames him not, but confirmed his wishes, as it follows, When Jesus heard these things, he marvelled.
How again does Matthew tell us that the centurion said, I am not worthy that thou shouldest enter under my roof, while Luke says here, that he beseeches Him that He would come. Now it seems to me that Luke sets before us the flatteries of the Jews. For we may believe that when the centurion wished to depart, the Jews drew him back, enticing him, saying, We will go and bring him. Hence also their prayers are full of flattery, for it follows, But when they came to Jesus, they besought him instantly, saying that he was worthy.
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Although it became them to have said, He himself was willing to come and supplicate Thee, but we detained him, seeing the affliction, and the body which was lying in the house, and so to have drawn out the greatness of his faith; but they would not for envy reveal the faith of the man, lest He should seem some great one to whom the prayers were addressed. But wherein Matthew represents the centurion to be not an Israelite, while Luke says, he has built us a synagogue, there is no contradiction, for he might not have been a Jew, and yet built a synagogue.
For as soon as he was freed from the annoyance of the Jews, he then sends, saying, Think not that it was from negligence I came not unto Thee, but I counted myself unworthy to receive Thee in my house.
Here observe that the centurion held a right opinion concerning the Lord; he said not, pray, but, command; and in doubt lest He should from humility refuse him, he adds, For I also am a man set under authority, &c.
But that you might see plainly that the Lord said this for the instruction of others, the Evangelist wisely explains it, adding, Verily I say unto you, I have not found so great faith, no, not in Israel.