In Judaism and in many other religous systems, there are calendar rituals of repentance, which imply that people "will do it again". On the average, poetry, folklore, and religion do foster personal growth, but do not expect it to take place all that rapidly.

Amazing Grace of course refers to St. Paul. If the Acts are complete, he no longer participated in religious persecution after his "conversion" (he had no chance, being in a small minority), but many of his followers certainly "did it again". And you can still go blind in Damascus nowadays.