And the commandment, which was ordained unto life. The commandments had a promise of Life. I found to be unto death. When he found that, instead of keeping the commandments, he had broken them, he realized he was under condemnation. For sin, taking occasion by the commandment, deceived me.
Sin is always a deceiver, however.
I cannot explain this save by referring it to a period of life when he was self-deceived, and sinned, thinking he was doing God service. It exactly describes the persecuting Saul of Tarsus. Sin deceived him. When he found he was deceived, it slew him. He was convicted before God.