Justification: The Doctrine that Opens the Gate to Paradise, Makes Chains Fall Off, and Strangely Warms the Heart

Though I lived as a monk without reproach, I felt that I was a sinner before God with an extremely disturbed conscience. I could not believe that he was placated by my satisfaction. I did not love, yes, I hated the righteous God who punishes sinners, and secretly, if not blasphemously, certainly murmuring greatly, I was angry with God, and said, As if, indeed, it is not enough, that miserable sinners, eternally lost through original sin, are crushed by every kind of calamity by the law of the decalogue, without having God add pain to pain by the gospel and also by the gospel threatening us with his righteousness and wrath!” Thus I raged with a fierce and troubled conscience.
Nevertheless, I beat importunately upon Paul at that place, most ardently desiring to know what St. Paul wanted. At last, by the mercy of God, meditating day and night, I gave heed to the context of the words, namely, “In it the righteousness of God is revealed, as it is written, ‘He who through faith is righteous shall live.’” There I began to understand that the righteousness of God is that by which the righteous lives by a gift of God, namely by faith. And this is the meaning: the righteousness of God is revealed by the gospel, namely, the passive righteousness with which merciful God justifies us by faith, as it is written, “He who through faith is righteous shall live.” Here I felt that I was altogether born again and had entered paradise itself through open gates. There a totally other face of the entire Scripture showed itself to me.
Thereupon I ran through the Scripture from memory. I also found in other terms an analogy, as, the work of God, that is what God does in us, the power of God, with which he makes us wise, the strength of God, the salvation of God, the glory of God. And I extolled my sweetest word with a love as great as the hatred with which I had before hated the word “righteousness of God.” Thus that place in Paul was for me truly the gate to paradise. (Martin Luther)
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“But one day as I was passing into the field, with some dashes on my conscience, fearing yet that all was not right, suddenly this sentence fell upon my soul, “Your righteousness is in heaven.” I thought I saw with the eyes of my soul Jesus Christ at God’s right hand. There was my righteousness. Wherever I was, or whatever I was doing, God could not say of me that I lacked His righteousness, for that was ever before Him. Moreover, I saw that it was not my good frame of heart that made my righteousness better, nor yet my bad frame that made my righteousness worse, for my righteousness was Jesus Christ Himself, “the same yesterday, today, and for ever“.
Now did my chains fall off my legs indeed. I was loosed from my afflictions and irons, my temptations also fled away. From that time those dreadful Scriptures of God quit troubling me; now I went home rejoicing for the grace and love of God.” (John Bunyan)
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"In the evening I went very unwillingly to a society in Aldersgate Street, where one was reading Luther’s preface to the Epistle to the Romans. About a quarter before nine, while he was describing the change which God works in the heart through faith in Christ, I felt my heart strangely warmed. I felt I did trust in Christ, Christ alone, for salvation; and an assurance was given me that He had taken away my sins, even mine, and saved me from the law of sin and death." (John Wesley)
Now to the one who works, pay is not credited as a gift, but as something owed. But to the one who does not work, but believes on him who justifies the ungodly, his faith is credited for righteousness. (Romans 4:4-5)