Thus they could not hear God's word on Mount Sinai when he talked to them, but they retreated, saying to Moses: "You speak to us, and we will hear; but let not God speak to us, lest we die" [Exod. 20:19]. To know God's commandment and to know how to keep it requires a high prophetic understanding.
Moses was well aware of that when he said in Exodus 34 that God forgives sin and that no one is guiltless before him, which is to say that no one keeps his commandments but he whose sins God forgives. As David also testifies in Psalm 32:1, "Blessed is he whose transgression is forgiven, ... to whom the Lord imputes no iniquity." And in the same psalm [cf. v. 6]: "Therefore let every one who is godly offer prayer to thee for forgiveness," which means that no saint keeps God's commandments. But if the saints fail to keep them, how will the ungodly, the unbelievers, the evil people keep them? Again we read in Psalm 143:2: "O Lord, enter not into judgment with thy servant; for no man living is righteous before thee." That attests clearly enough that even the holy servants of God are not justified before him unless he sets aside his judgment and deals with