New York Times Best Selling Author Tim Keller has a nice summary of Biblical Repentance:
And a quote from the 17th century Thomas Brooks:
Ah! Sinner, remember this, there is no way on earth effectually to be rid of the guilt, filth, and power of sin, but by believing in a Savior. It is not resolving, it is not complaining, it is not mourning, but believing, that will make you divinely victorious over that body of sin that to this day is too strong for you, and that will certainly be your ruin, if it be not ruined by the hand of faith.