3 The Lord then sat down in the house of a certain proud Pharisee. He was in his house, as I have said, and was not in his heart. But into this centurion's house He entered not, yet He possessed his heart. Zacchæus again received the Lord both in house and heart. Yet the centurion's faith is praised for its humility. For he said, “I am not worthy that You should come under my roof;” and the Lord said, “Verily I say unto you, I have not found so great faith, no, not in Israel;” according to the flesh, that is. For he too was an Israelite undoubtedly according to the spirit. The Lord had come to fleshly Israel, that is, to the Jews, there to seek first for the lost sheep, among this people, and of this people also He had assumed His Body. “I have not found there so great faith,” He says. We can but measure the faith of men, as men can judge of it; but He who saw the inward parts, He whom no man can deceive, gave His testimony to this man's heart, hearing words of lowliness, and pronouncing a sentence of healing.
Source: Sermons on Selected Lessons of the New Testament (New Advent)