I often hear Christians take a very self-absorbed view of sin; Because their forgiveness is assured in the finished work of Jesus Christ, they apply a faulty logic: I'm going to be forgiven, so what does it really matter? They never realize how their sin affects others and how it produces a more evil world.

It is selfish to use God's grace as a reason to not grow in godliness. I can't think of a single sin that doesn't have severe repercussions for others. I cannot steal without denying someone something that belongs to them; I cannot abuse alcohol or substances without endangering someone by my intoxication; I cannot lust without dehumanizing someone; I cannot display arrogance without belittling or dominating someone. To say, "Oh, but God forgives me, so what does it really matter?" is to completely discount everyone but myself." - taken from Boundless