You cannot seek to live under the principle of law without forfeiting the grace of God. O, that professed believers perceived this more clearly. Those attempting to please God and be holy through a system of regimentation only thrust themselves from His presence. God has provided a better way to approach Him, and He will deny anyone that takes another way. The two covenants provide a contrast between works and faith.
Real faith works incessantly and joyfully.
It is excluded. Justification, or full exoneration from the guilt of sin, is achieved by means of faith, not achievement. Righteousness, in this case, is not our own. Under Law, God would be Justifier if man was just. Under grace, or the new covenant, God is the Just One, as well as the justifier.