A lens works because it has one job.
Take a magnifying glass out into the sunlight. Hold it at the right angle over a piece of paper and something remarkable happens — all that diffuse energy, scattered across the whole sky, gets organized into a single point. And that point is hot enough to burn.
The same sunlight that warmed your face harmlessly for years becomes fire. Not because the energy changed, but because it stopped being scattered.
Pure doesn't primarily mean clean in the moral sense, though that's part of it. The Greek word is katharos — it means unmixed, undivided, unalloyed. A pure gold bar isn't pure because it has been sanitized. It's pure because there's nothing in it but gold. No zinc, no copper, no trace of something else diluting what it's supposed to be.
The impure heart isn't necessarily the corrupt heart. It may just be the divided one. The heart that wants God and also wants to be admired. The heart that follows Jesus and also cultivates a backup identity. The heart that prays on Sunday and compartmentalizes on Tuesday. Not a monster — just scattered. All that energy, diffused, harmless, warming the surface but never burning anything down.
Jesus says the pure in heart will see God. Not at the end of a long theological argument. Not after they've read enough books. They will see — present experience, personal encounter. The undivided heart develops a kind of clarity that the divided heart never gets. When you're not managing competing loyalties, you stop being distracted by them. And when you stop being distracted, you start noticing the God who was there all along.
I think a lot of us are exhausted from the divided life. Keeping track of which version of yourself is showing in which room. It's heavy. It costs more than we admit.
What if the call to purity is less about restriction and more about relief?