1 John 2:21
“I have not written to you because you don’t know the truth, but because you know it, and because no lie is of the truth.”
What does 1 John 2:21 mean?
John is writing to people who already understand the core truths of the faith, not to teach them something entirely new. His point is that they're already equipped to recognize deception when they encounter it, because they know what truth actually looks like. When you're familiar with something genuine, the counterfeit becomes obvious. He's essentially saying: you have the foundation you need, so use it to guard yourselves against false teaching. There's real encouragement here for anyone who feels uncertain about their faith. You don't need to be a theological expert to sense when something contradicts what you know about God's character and Jesus's love. That instinct comes from having encountered the real thing.