Ephesians 5:11-13

Take no part in and have no fellowship with the fruitless deeds and enterprises of darkness, but instead [let your lives be so in contrast as to] expose and reprove and convict them. For it is a shame even to speak of or mention the things that [such people] practice in secret. But when anything is exposed and reproved by the light, it is made visible and clear; and where everything is visible and clear there is light.