In sacrifice and offering you have not delighted, but you have given me an open ear. Burnt offering and sin offering you have not required. 7 Then I said, "Behold, I have come; in the scroll of the book it is written of me: 8 I delight to do your will, O my God; your law is within my heart" (Psalm 40:6-8 ESV).
In the well-known confessions of faith that came out of the Reformation and in the catechisms based on them, there is an important place given to the law, especially to the Ten Commandments. Was it right for the authors of those documents to do this? Many churches, even those linked more directly to the Reformation, have deviated little by little from such instruction. It is probably reasonable to assume that many church members would be embarrassed if they had to give the gist of the Ten Commandments in order, or even to give them all, much less have them memorized.