If Jesus is truly a joy in your heart, you will want to talk about him as much as you can, because talking about him would be a joy in itself. If you truly know Jesus, it would be impossible not to think about him all the time, for he is that beautiful and exciting to know. If he is your life, you will want to talk about him more than anything else. If he has done wonders to you, you will want to share that with everyone. Everything passes except him. Know him well to let him become your greatest joy.