Read Proverbs 17:22  I don't like to get a shot at the doctor's office, do you? I don't like to take medicine, do you?  But, when you're sick and can't seem to get any better, you will even get a shot or take medicine to get better.  That is what our verse is talking about.  No one likes medicine, but no one likes to be sick either.  But when you have a broken spirit, there is no medicine to help.  That is except a merry heart.  When you are feeling bored and you don't have anything to do, it is great for a friend to call and to invite you to do something with them.  When you are discouraged, it is good to have a friend to cheer you up.  When you feel like you just can't go on, it is good to have someone who can encourage you.  Sometimes a good laugh is just the thing.  A good laugh is, as the saying goes, "Just what the doctor ordered".  Laughter is good medicine for the soul.  God's Word is right.  A merry heart will lift your spirit.