Mommy told me something a little kid should know
It's all about the devil and I learned to hate him so
She said he causes trouble when you let him in your room
He'll never ever leave you if your heart is filled with gloom

So let the sun shine in, face it with a grin
Smilers never lose 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, the devil wears a grin
But oh, he starts [bad word] in when the [bad word] prowling in
I know he'll be unhappy 'cause I'll never wear a frown
Maybe if we keep on smiling he'll get tired of hanging 'round

If I forget to say my prayers the devil jumps with glee
But he feels so awful, awful when he sees me on my knees
So if you feel of trouble and you never seem to move
Just open up your heart and let the sun shine in

So let the sun shine in, face it with a grin
Smilers never lose 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
Sun shine in, sun shine in

Mommy told me something a little kid should know
It's all about the devil and I learned to hate him so

If I forget to say my prayers, the devil jumps with glee
But he feels so awful, awful when he sees me on my knees
So if you feel of trouble and you never seem to move
Just open up your heart and let the sun shine in