That’s the title of an excellent article by Gene Veith on the doctrine of vocation. From the introduction:
Whereas the doctrine of justification has wide currency, the doctrine of vocation has been all but forgotten. The word vocation can still be heard sometimes, but the concept is generally misunderstood or incompletely understood. The doctrine of vocation is not “occupationalism,” a particular focus upon one’s job. The term means “calling,” but it does not have to do with God’s voice summoning you to do a great work for him. It does not mean serving God by evangelizing on the job. Nor does the doctrine of vocation mean that everyone is a minister, though it is about the priesthood of all believers. It does not even mean doing everything for God’s glory, or doing our very best as a way to glorify God, though it is about God’s glory, at the expense of our own.
The doctrine of vocation is the theology of the Christian life. It solves the much-vexed problems of the relationship between faith and works, Christ and culture, how Christians are to live in the world. Less theoretically, vocation is the key to strong marriages and successful parenting. It contains the Christian perspective on politics and government. It shows the value, as well as the limits, of the secular world. And it shows Christians the meaning of their lives.
Read the whole thing. Veith is the author of God at Work: Your Christian Vocation in All of Life and Loving God with All Your Mind, both of which I found very helpful in writing Thriving at College.