2 Corinthians 13:5

"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.

"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?

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.