79. We were then sealed with the Spirit by God. For as we die in Christ, in order to be born again, so, too, we are sealed with the Spirit, that we may possess His brightness and image and grace, which is undoubtedly our spiritual seal. For although we were visibly sealed in our bodies, we are in truth sealed in our hearts, that the Holy Spirit may portray in us the likeness of the heavenly image.
Complete source paragraph · On the Holy Spirit, Chapter VI., source paragraph 6 · Original source