You might want to sing it note for note
Don't worry be happy
In every life we have some trouble
When you worry you make it double
Don't worry, be happy......" source: http://www.lyricsondemand.com/onehitwonders/dontworrybehappylyrics.html
However fun the song is, it does have some Biblical truth to it. Matthew 6:25-34 tells us that we have no reason for worry.... unless....
25“Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more than food, and the body more than clothes?26 Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? 27 Can any one of you by worrying add a single hour to your life? 28 “And why do you worry about clothes? See how the flowers of…