I once witnessed a dad talking to his little boy about his attitude.  They boy wanted to play with a particular toy, but his brother already had it and he was complaining and crying about it.  So his dad looked him the eyes and said "Georgey, you need to have a happy heart and I expect you to get a happy heart right now!"  Wait! Can you actually demand that someone get happy.  Do you have the right to expect something like that?  In our text God expects from us joy, prayer and thanksgiving - all the time!  Yes, even when your marriage gets insufferable, when your job is horrendous, when school pressures overtake you, when the doctor tells you there's no cure, God still expects you to rejoice, pray and give thanks.  Listen and find out how you can obey God iin the most difficult of situations.