I finished up my lectures tonight, after several days focusing on justice, with a discussion of vocation with an excellent group of high school students. My basic pitch was based on Ed Veith's excellent book, God at Work:
"God has chosen to work through human beings, who, in their different capacities and according to their different talents, serve each other. This is the doctrine of vocation." Gene Edward Veith, God At Work 14 (Crossway 2002).