“Romans 3:7: For if the truth of God hath more abounded through my lie unto his glory; why yet am I also judged as a sinner?”
In this passage Paul is not justifying lying. So even when a lie further displays God’s truthfulness it is still a lie. However, our sin results in showing that God is perfect. People that accused Paul of teaching that human sin leads to God’s glory is something in which Paul refutes. When we lie we sin. God is perfect and can’t be sinful. Christ is the standard of holiness and truth. So God’s judgement of our sin is completely fair and justified. We deserve to be judged by God. However, through Christ we are forgiven. In verses after it tells that it is impossible for us to never sin. Our sin does not bring glory to God. The reason we sin is because we are sinners and fallen from God. Paul also lets us know that our salvation should not be used as a license to sin (Romans 6:1). In Romans 3:8, Paul will brush aside this criticism as rank slander (Romans 3:8). Thank God for grace through Jesus Christ. Amen