Wise words from Henri Nouwen:
Joy does not simply happen to us. We have to choose joy and keep choosing it every day. It is a choice based on the knowledge that we belong to God and have found in God our refuge and our safety and that nothing, not even death, can take God away from us. 
I don’t know about you, but I need to practice choosing joy.
 Henri J. M. Nouwen, Here and Now: Living in the Spirit (New York, NY: The Crossroad Publishing Company, 1994), Kindle.