John Chrysostom
No one can say, says the Apostle, that my words are mere boasting. I can present many marks of my sacred ministry and proofs of my ordination. They are not the robe, the bells, the breastplate, or the mitre, as among those of the Old Testament. Rather, they are what inspires far greater reverent awe: signs and wonders.
It cannot be said that I was appointed by God and failed to fulfill what was entrusted to me. Better still, I did not accomplish this, but Christ did. Therefore I glory in Him. I glory not in some insignificant works, but in spiritual things.
This is what the words mean: "in the things pertaining to God" (Rom 15:17). That I accomplished what I was sent to do, and that my words are not boasting, is witnessed by the miracles and by the obedience of the Gentiles.
Read more (171 words)
"For I dare not speak of anything which Christ has not wrought through me, for the obedience of the Gentiles, by word and deed, in the power of signs and wonders, by the power of the Spirit of God."
See how the Apostle strives to prove that everything belongs to God, and not to himself. If I speak anything, or act, or work miracles, Christ does all this. The Holy Spirit does all this. In saying this, he also shows the dignity of the Spirit.
Do you see how all this, the sacrifice, the offering, and the symbols, are more wondrous and fearful than the Old Testament ministry? When he says, "by word and deed, in the power of signs and wonders," the Apostle means teaching, philosophizing concerning the Kingdom of God, the manifestation of works and life. The raising of the dead, the casting out of demons, the sight of the blind, the walking of the lame, and all the other wondrous acts which the Holy Spirit performed in us.