A.T. Robertson Commentary Ephesians 5:13

"But all things when they are reproved are made manifest by the light: for everything that is made manifest is light." — Ephesians 5:13 (ASV)

Are made manifest by the light (υπο του φωτος φανερουτα). Turn on the light. Often the preacher is the only man brave enough to turn the light on the private sins of men and women or even those of a community.