Engaged, Consumed, Doing
I heard it said by a wiser one than I. "The struggle to succeed is more consuming and satisfying than being successful." Looking at my own life, I think I've been happiest when I have been totally engaged in the struggle. Partly this is because I just didn't have the time or energy to think about anything else, I was just occupied in the doing of the thing, whatever it happened to be. So to always be engaged in the doing is probably a good way to conduct a life. Engaged, consumed, doing.