Ammonius of Alexandria : "And the faith which is through him." This is said because someone is healed through the faith that is directed to Christ. For it is necessary that the faith of both concur, that is, the faith of the one healed and the faith of the one praying over the sick person. This we see in the case of the paralytic and the woman with the flow of blood. — CATENA ON THE ACTS OF THE APOSTLES 3.16 John Chrysostom : "And His name, through faith in His name, hath made this man strong, whom ye see and know: yea, the faith which is by Him hath given him this perfect soundness in the presence of you all." Seeking to declare the matter, he straightway brings forward the sign: "In the presence," he says, "of you all." As he had borne hard upon them, and had shown that He Whom they crucified had risen, again he relaxes, by giving them the power of repentance. — Homily on Acts 9 John Chrysostom : And yet it was "the faith which is in Him" (as its object) that did all. For the Apostles did not say, "By the name," but, "In the name," and it was in Him that the man believed. But they did not yet make bold to use the expression, "The faith which is in Him." For, that the phrase "By Him" should not be too low, observe that after saying, "Upon the faith of His name," he adds, "His name hath made him strong," and then it is that he says, "Yea, the faith which is by Him hath given him this perfect soundness." Observe how he implies, that in the former expression also "Whom God raised up," he did but condescend to their low attainments. For that Person needed not Another's help for His rising again, Whose Name raised up a lame man, being all one as dead. — Homily on Acts 9 John Chrysostom : Mark how on all occasions he adduces their own testimony. Thus above, he said, "As ye yourselves also know;" and, "In the midst of you:" and here again, "Whom ye see and know: in the presence of you all." And yet that it was, "In His name," they knew not: but they did know that the man was lame, that he stands there whole. They that had wrought the deed themselves confessed, that it was not by their own power, but by that of Christ. And had this assertion been unfounded, had they not been truly persuaded themselves that Christ had risen again, they would not have sought to establish the honor of a dead man instead of their own, especially while the eyes of the multitude were upon them. — Homily on Acts 9 Oecumenius : That is, what am I saying, having believed in his name he was strengthened? And before he had believed, the name alone having been invoked strengthened him; so great is the grace that the name supplies. For he had not yet believed, but the mere call of the name had accomplished everything. — Commentary on Acts Oecumenius : What then is the faith proclaimed through him? He explains it himself. "That they may know you the only true one," (Jn. 17:3) and then: Then, for fear that anyone say, "Therefore even an unbeliever will call upon his name, and even when treating an unbeliever the healing will nonetheless proceed, if the mere call of the name were what secured it"—so that no one may say this, he adds, "And the faith which is through him." That is, the name is indeed great and a source of healings, but souls capable of being deemed worthy of grace are also required. For if the name is invoked by unbelievers, and an unbeliever is going to remain one in need of healing, the proper power of the healing would not be at work. To say, "His name secured him," would be lofty and absolute and would harden the Jews. But "The faith which is through him" is humble. Peter blends the humble with the lofty, those things belonging by nature to the matter, and those belonging to the disposition and power of the hearers, because of the agreeable reception. — Commentary on Acts