Righteousness Is More Than Guiltlessness
Suppose, for instance, I promise to my servants a reward for keeping my commands, and threaten punishment for breaking them. At the end of the appointed time, one of them has kept them, and receives the reward. A second one has broken them, and is chastised. Suppose this second should then arise and claim his reward also, on the ground that suffering the full penalty of the breach was an entire equivalent for perfect obedience. Common sense would pronounce it absurd…Since Christ steps into the sinner’s stead, to fulfill in his stead the whole Covenant of Works, He must, in order to procure to us full salvation, both purchase pardon for guilt, and a positive title to favor and life. The sinner needs both.
-R.L. Dabney- Lectures in Systematic Theology