Ambrosiaster : He instructs that brothers should examine themselves to discuss with one another; they become more concerned if they compare themselves with each other. Therefore, he wanted this temptation to be understood as a test; because every test is a temptation, but not every temptation is a test. For if God is said to test, it is a test; but if the devil is said to test, it is a temptation, because he seeks to overthrow. And a person sometimes tries in order to test; sometimes, in order to capture. This is what he says, that if you do not know how to test yourselves, you do not know that Jesus Christ is in you, and this is to be reprobate, to not know the truth of one's own faith. For whoever has the sense of their faith in their heart, they know that Christ Jesus is in them. — Commentary on 2 Corinthians Clement of Alexandria : "But the very hairs of your head are all numbered," says the Lord; those on the chin, too, are numbered, and those on the whole body. There must be therefore no plucking out, contrary to God's appointment, which has counted them in according to His will. "Know ye not yourselves," says the apostle, "that Christ Jesus is in you?" Whom, had we known as dwelling in us, I know not how we could have dared to dishonour. — The Instructor Book 3 John Chrysostom : "Try your own selves, whether ye be in the faith, prove your own selves. Know ye not as to your own selves, that Christ is in you, unless indeed ye be reprobate?" For since by what he has said he hath shown that even if he does not punish, it is not because he hath not Christ in himself, but because he intimates His long-suffering, Who was crucified and yet avenged not Himself; he again, in another manner, produces the same effect, and still more irrefragably, establishing his argument by the disciples. — Homily 29 on 2 Corinthians John Chrysostom : "For why speak I of myself," he says, "the teacher, who have so much care upon me and am entrusted with the whole world and have done such great miracles. For if ye will but examine yourselves who are in the rank of disciples, ye will see that Christ is in you also. But if in you, then much more in your teacher. For if ye have faith, Christ is in you also." For they who then believed wrought miracles. Wherefore also he added, "Try your own selves, prove your own selves, whether ye be in the faith. Know ye not as to your own selves, unless indeed that Christ is in you, ye be reprobate?" But if in you, much more in your teacher? — Homily 29 on 2 Corinthians John Chrysostom : He seems to me here to speak of the "faith" which relates to miracles. "For if ye have faith," he says, "Christ is in you, except ye have become reprobates." Seest thou how again he terrifies them, and shows even to superfluity that Christ is with Him. For he seems to me to be here alluding to them, even as to their lives. For since faith is not enough [by itself] to draw down the energy of the Spirit, and he had said that "if ye are in the faith" ye have Christ in you, and it happened that many who had faith were destitute of that energy; in order to solve the difficulty, he says, "except ye be reprobate," except [that is] ye are corrupt in life. — Homily 29 on 2 Corinthians