"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that."

King is really saying: you can’t fix a problem by using more of the same thing that caused it. If a room is dark, adding more darkness doesn’t help; you need light. In the same way, if someone hurts us, snapping back with more anger or hate might feel satisfying for a moment, but it doesn’t actually heal anything. It just keeps the cycle going. Think about arguments with family, messy breakups, conflicts at work, when one person finally chooses patience, honesty, or kindness instead of revenge, the whole tone shifts. This quote isn’t asking us to be doormats; it’s reminding us that real change, in our relationships and in the world, starts when someone is brave enough to bring light and love into a place that doesn’t seem to deserve it.