2 Corinthians 3:18

But we all--Christians, as contrasted with the Jews who have a veil on their hearts, answering to Moses' veil on his face. He does not resume reference to ministers till Co2 4:1. with open face--Translate, "with unveiled face" (the veil being removed at conversion): contrasted with "hid" (Co2 4:3). as in a glass--in a mirror, namely, the Gospel which reflects the glory of God and Christ (Co2 4:4; Co1 13:12; Jam 1:23, Jam 1:25). are changed into the same image--namely, the image of Christ's glory, spiritually now (Rom 8:29; Jo1 3:3); an earnest of the bodily change hereafter (Phi 3:21). However many they be, believers all reflect the same image of Christ more or less: a proof of the truth of Christianity. from glory to glory--from one degree of glory to another. As Moses' face caught a reflection of God's glory from being in His presence, so believers are changed into His image by beholding Him. even as, &c.--Just such a transformation "as" was to be expected from "the Lord the Spirit" (not as English Version, "the Spirit of the Lord") [ALFORD] (Co2 3:17): "who receives of the things of Christ, and shows them to us" (Joh 16:14; Rom 8:10-11). (Compare as to hereafter, Psa 17:15; Rev 22:4). Next: 2 Corinthians Chapter 4

— Jamieson-Fausset-Brown Commentary (public domain)