that the name of our Lord Jesus{TR adds "Christ"} may be glorified in you, and you in him, according to the grace of our God and the Lord Jesus Christ.
Scholars of the Greek language maintain different opinions concerning the proper understanding of the phrase "of our God and the Lord Jesus Christ": The differences arise over whether "God and the Lord" has reference to one person (Jesus) or two (God and Jesus). Robertson, contends that "since there is only one article with theou (God) and kuriou (Lord) that one person be meant" (Vol. IV 46). This idea is based upon other passages of scripture that definitely use both titles in reference to Jesus. For example Titus writes, "Looking for that blessed hope, and the glorious appearing of the great God and our Savior Jesus Christ" (2:13). The meaning of this passage would remain the same regardless of which understanding is correct because God and the Lord Jesus Christ are one in doctrine. Jesus came to do the Father’s will and not His own. Therefore, whatever is done by the grace of the Father, the same is done by the grace of Jesus Christ. "For I came down from heaven, not to do mine own will, but the will of him that sent me" (John 6:38).