Romans 3:7

The truth of God. That is, God’s truthfulness, or veracity, His fidelity to His promises.

Hath more abounded. God’s truthfulness could not be increased, but it may abound more to His glory by being more fully manifested.

My lie. That is, my falsehood, my unfaithfulness, to the claims of God and conscience, my virtual denial of the truth of God’s promises, especially by my rejection of His offer of salvation through Christ. Paul repeats the contrast of v. 4, but this time, perhaps for the sake of argument, he speaks as though he himself were raising the objection (cf. 1 Cor. 4:6).

Judged. Or, “condemned” (see on ch. 2:1). If my unbelief and falsehood serve to reveal the truthfulness of God, why am I still being condemned as a sinner? How can an act that tends to promote the glory of God be regarded as evil? And if this objection be valid, why should we not continue in sin so that more good may result? Paul does not stop to explain the obvious fallacy of such reasoning, so destructive of all morality. It is self-evident that the sinner deserves no credit for the good that, contrary to his intentions, comes out of his sin.