What did the law show about man and how is the indwelling Holy Spirit different from the law?
The law served as a mirror that showed man his utter sinfulness and helplessness. The indwelling Holy Spirit is something totally different; the law shows, while the Spirit indwells. In the same context, God sent His Son in the likeness of sinful flesh to condemn the old Adam and the flesh.
Les teaches that the law was just the mirror that showed man his utter sinfulness and helplessness, but the indwelling Holy Spirit is something totally different. He then returns to verse 3 and Ephesians 1, where God sends His own Son in the likeness of sinful flesh. Les says this is something he cannot comprehend except through the eyes of faith: the Creator God Himself, Jesus Christ, was the Creator of Genesis 1, the One who spoke the universe into being and formed Adam from the dust. Jesus Christ is the likeness of sinful flesh, and for the sake of dealing with the old Adam, He condemned the old Adam and the flesh. That was His whole purpose in coming, to get down at man's level, in man's frame of flesh, that He might condemn sin and the flesh.