Paul in Ephesians 4:17-19 is insisted that the church of Ephesus no longer live with their former rags of sin!  The light that pointed out their sin and used to offend them was now to be seen as living waters that sustains them!  In this passage Paul reminds the church of Ephesus to put off their old self by acquiring a new attitude that the truth found in Jesus Christ can set them free to embrace holiness and righteousness.