Martin Luther, Daily Walk, May 5, 1992
"Although out of pure grace God does not impute our sins to us, He nonetheless did not want to do this until complete and ample satisfaction of His law and His righteousness had been made. Since this was impossible for us, God ordained for us, in our place, One who took upon Himself all the punishment we deserve.
"He fulfilled the law for us. He averted the judgement of God from us and appeased God's wrath. Grace, therefore, costs us nothing, but is cost Another much to get it for us. Grace was purchased with an incalculable, infinite treasure, the Son of God Himself."