The hardest people to reach with the love of God are not the bad people. They know they are bad. They have no defense. The hardest ones to win for God are the self-righteous people.
Beware of self-righteousness in every possible shape and form. Some people get as much harm from their "virtues" as others do from their sins.
People who walk around with a self-righteous chip on their shoulder should first assess if their shoulder can bear the weight, lest they be weighed down by what they carry.