I had conceived a burning desire to understand what Paul meant in his Letter to the Romans, but thus far there had stood in my way, not the cold blood around my heart, but that one word which is in chapter one: “The justice of God is revealed in it.” I hated that word, “justice of God,” which, by the use and custom of all my teachers, I had been taught to understand philosophically as referring to formal or active justice, as they call it, i.e., that justice by which God is just and by which he punishes sinners and the unjust.
But I, blameless monk that I was, felt that before God I was a sinner with an extremely troubled conscience. I couldn’t be sure that God was appeased by my satisfaction. I did not love, no, rather I hated the just God who punishes sinners. In silence, if I did not blaspheme, then certainly I grumbled vehemently and got angry at God. I said, “Isn’t it enough that we miserable sinners, lost for all eternity because of original sin, are oppressed by every kind of calamity through the Ten Commandments? Why does God heap sorrow upon sorrow through the Gospel and through the Gospel threaten us with his justice and his wrath?” This was how I was raging with wild and disturbed conscience. I constantly badgered St. Paul about that spot in Romans 1 and anxiously wanted to know what he meant.
I meditated night and day on those words until at last, by the mercy of God, I paid attention to their context: “The justice of God is revealed in it, as it is written: ‘The just person lives by faith.'” I began to understand that in this verse the justice of God is that by which the just person lives by a gift of God, that is by faith. I began to understand that this verse means that the justice of God is revealed through the Gospel, but it is a passive justice, i.e. that by which the merciful God justifies us by faith, as it is written: “The just person lives by faith.” All at once I felt that I had been born again and entered into paradise itself through open gates. Immediately I saw the whole of Scripture in a different light. I ran through the Scriptures from memory and found that other terms had analogous meanings, e.g., the work of God, that is, what God works in us; the power of God, by which he makes us powerful; the wisdom of God, by which he makes us wise; the strength of God, the salvation of God, the glory of God.
I exalted this sweetest word of mine, “the justice of God,” with as much love as before I had hated it with hate. This phrase of Paul was for me the very gate of paradise.
~Martin Luther~
Here I Stand: A Life of Martin Luther (Peabody, Massachusetts; Hendrickson Publishers; 2009) p.49-50
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The Old Guys 
John Calvin – Christ, Our Righteousness
6 MarIt is necessary that Christ should come to our aid; who, being alone just, can render us just by transferring to us his own righteousness. You now see how the righteousness of faith is the righteousness of Christ. When therefore we are justified, the efficient cause is the mercy of God, the meritorious is Christ, the instrumental is the word in connection with faith. Hence faith is said to justify, because it is the instrument by which we receive Christ, in whom righteousness is conveyed to us. Having been made partakers of Christ, we ourselves are not only just, but our works also are counted just before God, and for this reason, because whatever imperfections there may be in them, are obliterated by the blood of Christ; the promises, which are conditional, are also by the same grace fulfilled to us; for God rewards our works as perfect, inasmuch as their defects are covered by free pardon.
~John Calvin~
Commentary on the Epistle of Paul the Apostle to the Romans (Bellingham, WA: Logos Bible Software, 2010), 138–139.
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