I have always liked this verse because when days at work really get tough and I ponder slacking off, I think of this verse. It is Christ whom I work for. I must give Him my all!
“Whatever you do, work at it with all your heart, as working for the Lord, not for men, since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving.”
Colossians 3:23-24