There's a famous story about Dizzy [Gillespie] and Art Blakey taking him aside, and spending a whole night-long talk with [Phil Wood], "Man we believe in you. You can play. So don't be walking around with a frown on your face or whatever, getting yourself into trouble. You have got a gift, and nobody is going to take that away from you. " So that meant the world to him.
The joy of the presence of Jesus, you must be able to give wherever you go. But you cannot give what you don't have. That's why you need a pure heart, a pure heart that you will receive as a fruit of your prayer, as a fruit of your oneness with Christ.