"A merry heart doeth good like a medicine: but a broken spirit drieth the bones." -Proverbs 17:22, KJV.
All too often, we as Christians (myself very much included), act as if life is to be drudged through. This attitude does nothing but wear us out! God gave us this life to be enjoyed, not simply endured. Yes, we will have trials--it would be foolish to think otherwise. However, simply because we have trials doesn't mean we can't enjoy our families, churches, friends, and even our jobs. The most important thing to remember to enjoy is our relationship with God; He can give you a great perspective on any trial, and truly let you have merry heart.