When you are working how should you act?

During the holidays, most families have had time off from work.  We all talk about how much we enjoyed being with each other and how we do not want to go back to work.  However, we know that we have to go back to work and we have to be focused on getting our work done.  With all this time together and away from work, it is hard to go back and have a good attitude.

Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, Colossians 3:23 (NIV)

Does this passage help you to focus on how you should work?  Do you spend more time looking forward to weekends and holidays than working for the Lord?  How should you prepare your heart for work?