"There are two things which are indispensable to the Christian's life: first, a clear knowledge of duty, and second, a conscientious practice of duty corresponding to his knowledge. As we can have no well-grounded hope of eternal salvation without obedience, so we can have no sure rule of obedience without knowledge. Although there may be knowledge without practice, yet there cannot possibly be practice of God's will without knowledge. And therefore that we might be informed what we ought to do and what to avoid, it has pleased the Ruler and Judge of all the earth to prescribe for us laws for the regulating of our actions. When we had miserably defaced the Law of nature originally written in our hearts, so that many of its commandments were no longer legible, it seemed good to the Lord to transcribe that Law into the Scriptures, and in the Ten Commandments we have a summary of the same."-from the Introduction