Mummy told me something a little boy should know Its all about the devil and I've learnt to hate him so She said he causes trouble when you let him in the room He will never ever leave you if your heart is filled with gloom So let the sun shine in, face it with a grin Smilers never loose and frowners never win So let the sun shine in, face it with a grin Open up your heart and let the sun shine in When you are unhappy and the devil wears a grin But oh he starts running when the right comes firing in I know he'll be unhappy 'cos I never wear a frown Maybe if I keep smiling he get tired of hanging round So let the sun shine in, face it with a grin Smilers never loose and frowners never win So let the sun shine in, face it with a grin Open up your heart and let the sun shine in If I forget say my prayers the devil jumps with glee He feels so awful awful when he sees me on my knee So if your full of troubles and you never seem to win Just open up your heart and let the sun shine in So let the sun shine in, face it with a grin Smilers never loose and frowners never win So let the sun shine in, face it with a grin Open up your heart and let the sun shine in