John Ritenbaugh, citing an article by George Friedman on "Manners and Political Life," describes manners as cultural conventions established to maintain civility and progress. The Ten Commandments are manners set by the Highest Authority to maintain civility and progress in an entire nation. God is the ultimate manner-creator, …
Even though keeping the law does not justify us, it does point out to us what sin is. The law is a guide keeping us within moral and ethical boundaries.
When a righteous man feels an inclination to sin, God will place stumblingblocks in his way to force moral choices, as well as a watchman to give understanding.
Mechanically keeping the law is only the beginning of righteousness. By emphasizing principle, Christ came to magnify, not to destroy God's law.