Let your joy be in your journey, not in some distant goal.
I personally admire Steve Jobs not most for what he did, or what he said, but for what he stood for. The largest lesson I learned from Steve was that the joy in life is in the journey, and I saw him live this every day.
So I had to figure out for myself what was right and true. It was a search. It was a process. It drew on the moral sense that I'd learned from my parents, and in church, and in my own heart, and led me on my own journey of discovery.