R.L. Dabney: God's acceptance of Christ's perfect obedience does not free us from God's Law as a rule of living, and there is no injustice in this

“Now, as God’s accepting the substitutionary righteousness at all was an act of mere grace, the extent to which He shall accept it depends on His mere will. And it can release us no farther than He graciously pleases to allow. Hence, if He tells us, as He does, that He does not so accept it, as to release us from the law as a rule of living, there is no injustice.” –R.L. Dabney, “Systematic Theology”