“God is intolerant of sin, but just as infinite in his love and long-suffering. God is just and righteous, unable to let bygones be bygones, and yet he is free to have mercy on whom he will have mercy. To have mercy on the wicked, however, God cannot suspend his justice. God’s justice did not require the salvation of anyone, so his grace is totally free. When God is gracious toward sinners, it is not because his justice is sacrificed to his love, but because he has freely found a way to be ‘just and the justifier of the ungodly’ (Rom. 3:26). At the cross, not only God’s love but his strangeness–his utter difference from us–is most clearly displayed.” (Michael Horton)
For more on this subject, please visit Modern Reformation.