Open up your heartthe cowboy church sunday school my mommy told me something a little girl should knowit's all about the devil and i've learned to hate him soshe says he causes trouble when you let him in the roomhe will never ever leave you if your heart is filled with gloomso let the sun shine in, face it with a grinsmilers never lose and frowners never winso let the sun shine in, face it with a grinopen up your heart and let the sun shine in.when you are unhappy the devil wears a grinbut oh, he starts a running when the light comes pouring ini know he'll be unhappy cause i'll never wear a frownmaybe if we keep on smiling he'll get tired of hanging around.