Colossians 3:23-25

And whatever you do, do it heartily, as to the Lord and not to men, knowing that from the Lord you will receive the reward of the inheritance; for you serve the Lord Christ.  But he who does wrong will be repaid for what he has done, and there is no partiality.  

The devil works night and day to keep our thinking small.  However, God directs us to have a positive attitude in whatever we do because we are doing it for God.  Our mindset changes when we know who we serve in everything we do.  We can feel joy, knowing that our inheritance is with Jesus, the Lord.