Do your work with a happy heart

Dave and I teach second-graders in Sunday School. Our memory verse for this month has been Colossians 3:23. It is important for children to learn to do their work with a happy heart. Here is that verse in The B-I-B-L-E:
"Always work hard. Always have a happy heart. You work for your master. But pretend you are working for God. You try to make your master happy. But pretend you are working to make God happy" (Colossians 3:23, The B-I-B-L-E). This verse is in the context of Paul's instructions for slaves. It is very applicable for us too in whatever task we are doing.