The “glory of God” in Romans 3:23 is the manifestation of His presence. In the Old Testament, God’s presence was the outward Shekinah glory. In the New Testament, God’s glory was manifested in Christ about whom John could testify, “we beheld his glory, the glory of the only begotten of the Father” (John 1:14). Every sinner has fallen short of being Christ like. He is the standard against which every person must measure himself. Every believer is presently being changed into Christ image (Romans 8:28) and one day will perfectly “be changed into the same image from glory to glory even as by the Spirit of the Lord” (2 Corinthian 3:18).