John Newton on Biblical Law

"Another lawful use of the Law is, to consult it as a rule and pattern by which to regulate our spirit and conversation. The grace of God, received by faith, will dispose us to obedience in general, but through remaining darkness and ignorance we are much at a loss as to particulars. We are therefore sent to the Law, that we may learn how to walk worthy of God, who has called us to his kingdom and glory; and every precept has its proper place and use." 

-- John Newton, from John Newton Letters