The Repentance of Saint Peter The Merciful

When a man clearly senses God's mercy toward him, he is startled, as from a dull and senseless dream, and becomes ashamed of his long blindness to God's unceasing compassion. In the time of Emperor Justinian, the chief imperial tax collector in Africa was a certain Peter, a very wealthy but very hard and merciless man. The beggars grumbled among themselves, that not one of them had ever received alms from Peter. Then, one of them bet that he would succeed in getting alms from Peter. He persistently begged alms of the miser until Peter, in a rage, hit him with a loaf of bread, since he had nothing else close at hand. Joyfully the beggar took the bread and fled. Immediately after this Peter became seriously ill and had this vision: He was being interrogated by demons in the other world. 
There was a scale, and on one side of it, the demons heaped Peter's sins, making that side extremely heavy. On the other side-which was empty-angels stood, sorrowing that they had not even one good deed in Peter's life to help balance the scale. One of them said: ``We have nothing to place on the scale except one loaf of bread, with which he struck a beggar the day before yesterday.'' The angels placed this one loaf of bread on the empty side of the scale, and that loaf of bread outweighed the other side of the scale, laden with all of Peter's sins. When the vision was over Peter said to himself: ``Indeed, this was not an apparition but the living truth, for I saw all my sins from my youth. And when I can be helped so much by one loaf of bread that I threw at a beggar, how much help would I receive from many deeds of almsgiving, performed from the heart and with humility?'' 
And from that time, Peter became the most compassionate man in his town. He distributed all of his possessions to the poor, and when he had finished distributing his possessions, he sold himself into slavery for thirty gold pieces and distributed even his own price as a slave to the poor as alms in the name of Christ. He was, thereafter, called Peter the Merciful.

Taken From Saint Nikolai Velimirovich's  "The Prologue From Ohrid"