Everyone who has this hope set on him purifies himself, even as he is pure.
This to me is one of the most purifying hopes within the church: Jesus is coming at any moment, and I'm gonna be changed to be just like Him. I'm gonna see Him as He is. And so that keeps me from doing a lot of things that I might otherwise do, from getting involved in a lot of wasted time that I might otherwise get involved in, because the Lord is coming soon and I want to use my time for His glory. Keep myself pure.