The Undefeatable Decalogue

"The Reformed faith insists upon God's supreme authority. 'The duty which God requireth of man, is obedience to his revealed will' (WSC, Q.39). That revealed will (the moral law) is 'summarily comprehended in the Ten Commandments' (WSC, Q.41), which are found in Exodus 20 and Deuteronomy 5. It is not difficult to relate all of the commands in the Bible to one or more of the Ten Commandments (cf. Matt 5:17—48). That moral law is binding upon all men for all time. Prior to our conversion, it 'was put in charge to lead us to Christ that we might be justified by faith' (Gal. 3:24). That is, it revealed our sin and need of a Savior. After conversion, it is a rule of gratitude for the covenant people of God in their thankful service to their Deliverer."

- Thomas E. Tyson and G.I. Williamson, What is the Reformed Faith?, Part II, p. 22