Expose the Darkness
Eph 5:11-14 Have nothing to do with the fruitless deeds of darkness, but rather expose them. For it is shameful even to mention what the disobedient do in secret. But everything exposed by the light becomes visible, for it is light that makes everything visible. This is why it is said: "Wake up, O sleeper, rise from the dead, and Christ will shine on you."
That is to expose the fruitless deeds of darkness for what they are. They're fruitless in that nothing good comes of them. Those who embrace the practice of evil don't want sin exposed for what it is. Thus Jesus said, "Light has come into the world, but men loved darkness instead of light because their deeds were evil. Everyone who does evil hates the light, and will not come into the light for fear that his deeds will be exposed <1651>." John 3:19,20 Not everyone wants Christ to shine on them and bring to light their deeds.
"expose" <1651> means to rebuke with sufficient cause, and also effectually, so as to bring the one rebuked to a confession or at least a conviction of sin. In other words, it means to convince, also translated "rebuke". For example Paul commanded, "Those who sin are to be rebuked <1651> publicly, so that the others may take warning." 1Tim 5:20