" So from the context of 1 Thessalonians 5 I say that the key to “rejoice always” is to “pray without ceasing.” Lean on God all the time for the miracle of joy in your life. Never give up looking to him for help. Come to him repeatedly during the day and often. Make your default mental state a Godward longing for all that you need, especially for spiritual desires. "

― John Piper