I have been convinced of the power and importance of repentance ever since i learned the book gates of repentance by R. Yona of Gerondi at the Mir yeshiva in N.Y. In the local breslov place on this side of the pond I once told a story of repentance that I think brings out the point more powerfully than anything else I can think of. It regards Henry II. In short, he had a great friend, Thomas Becket whom he had made archbishop of Canterbury [assuming he would do his bidding]. But something unexpected happened after that. In the Middle Ages there was one authority above the king. Thomas Becket  found God. There after he was going to do God's bidding. This infuriated the king. So one day in a fit of rage he yelled at some of his knights. ''Who will rid me of this priest? They misunderstood him and thought he really meant to kill Becket. So they went to Canterbury and killed becket. after that thing started going terribly wrong. his wife Elenore went to her ex husband the king of France and began plotting to put her on John on the throne of England. And his son John also got the king of Scotland to invade England from the north and the invasion from France and the north had begun. everything wa going a wrong a thing could go for the king of England personally and politically. His own sons and wife were out to get him and had engaged two powerful kings to do so. So what did Henry do. Collect troops and engage in battle? No. He realized his problems were not from kings or princes. It was the hand of Thomas Becket reaching from beyond. So he was going to repent in the most astounding manner that he could. He sailed from France where he was at that time and went straight to Canterbury. Outside the city he removed his boots and began walking toward the cathedral through the streets which were filled with sharp rocks and broken pottery. as he walked he left a bloody trail of his own bleeding feet behind him. When he got to the cathedral he went below  where the shrine of Becket was. There he ordered the monks --each one to whip him with all his might five times each. For the hundred monks that were there that meant he received 500 lashes, He fainted many time before it was over. But by a miracle, the next day  he got the news that the king of Scotland had been captured and the whole rebellion was squashed.