1 Corinthians 7:21

Art thou called being a servant? care not for it: but if thou mayest be made free, use it rather (KJV)

Then: Always, always, always, Paul looks to the highest calling of serving of the Lord. There is no time for lesser pursuits. Every action, every problem, every goal is put into the hierarchy of being one who gives everything to the Lord. There is no other purpose for life, but to find joy in being with the Lord. To disappoint him is unbearable. Nothing else matters. If you are a servant, serve God over and above your earthly master. If you become a freeman, serve God. Ignore all trivial, personal pursuits.

Now: Until retirement, a person's work or vocation occupies the major quantity of each day. The believer's opportunities to serve Christ arise in those circumstances. Workers in the church focus on equipping the others with skills and knowledge to bring Christ's teachings to those who don't come to church. Workers in the secular world take what they know and use it where they are. Each individual works in the place designated by the Lord.