There is a medieval belief that angels want to sing to us. It makes them happy to do so. All we have to do is listen.
To the degree that each of us is dedicated to wanting there to be peace in the world, then we have to take responsibility when our own hearts and minds harden and close. We have to be brave enough to soften what is rigid, to find the soft spot and play with it. We have to have that kind of courage and take that kind of responsibility. That's the true practice of peace.