Whatever you do, work heartily, as for the Lord and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ. (Col. 3:23-24)
In Colossians 3:23-24, Paul has a very clear mandate for how we should conduct ourselves while at work. We are to approach our daily tasks as if we were working directly for the Lord, but this does not mean we should constantly feel the pressure of such a lofty calling! Working for the Lord frees us from trying to constantly please others, while shifting our focus back to a standard of excellence that will permeate everything we do. Whatever our job, task, ministry, hobby, relationship... we are called to give it our best, and the rewards are eternal. Serve Him joyfully, and watch even your most dreaded and bothersome tasks (laundry, anyone?) gather meaning as you show your love for the Lord simply by giving it your all.
“If a man is called to be a street sweeper, he should sweep streets even as a Michaelangelo painted, or Beethoven composed music or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and earth will pause to say, 'Here lived a great street sweeper who did his job well.” - Martin Luther King, Jr.