John Gerstner on "The Perfect Justice of Pure Grace."

"The full wrath of God deserved by the sinner was poured out in full on the sinner’s Substitute. And that punishment undergone by the sinner in his substitute was more than the sinner would have suffered by an eternity in hell, for the sinner’s Substitute was no less than the fulness of the Godhead dwelling bodily (Colossians 2:9). God cannot die in His own infinite, spiritual, unchangeable, eternal nature, but He could and did die in the real human nature to which He united Himself for the very purpose of suffering and dying so that His people need never suffer ever at the hand of a holy and just God. Surely mercy and truth kissed each other in perfect justice.

Thus, the sinner was punished. No sinner ever escapes the justice of God—least of all those for whom Jesus Christ suffered, bled, and died. Christ descended into hell on the cross. Because Christ descended into hell, those for whom He died ascend into heaven. They went to hell with Him and they will go to heaven with Him. That is the perfect justice of pure grace."

John Gerstner, Justification by Faith Alone
Link: http://www.apuritansmind.com/Justification/GerstnerJohnJustification.htm