'To find God we must repent of the things we have done wrong, but if that is all you do, you may remain just an elder brother. To truly become Christians we must also repent of the reasons we ever did anything right. Pharisees only repent of their sins, but Christians repent for the very roots of their righteousness too. We must learn to repent of the sin under all our other sins and under all our righteousness - the sin of seeking to be our own Savior and Lord.'
Timothy Keller, The Prodigal God, p.78.