Repentance is a HUGE topic!!! My friend Lou is running a series about repentance right now that's written by another friend Phillip Evans. It's entitled "Clearing Up Repentance." I haven't read all of it, but I trust Brother Evans, and what I have read is good.
Or do you despise the riches of His goodness, forbearance, and longsuffering, not knowing that the goodness of God leads you to repentance?
Luke 13:1-51 There were present at that season some who told Him about the Galileans whose blood Pilate had mingled with their sacrifices. 2 And Jesus answered and said to them, “Do you suppose that these Galileans were worse sinners than all other Galileans, because they suffered such things? 3 I tell you, no; but unless you repent you will all likewise perish. 4 Or those eighteen on whom the tower in Siloam fell and killed them, do you think that they were worse sinners than all other men who dwelt in Jerusalem? 5 I tell you, no; but unless you repent you will all likewise perish.”