That's why I open up I open up my heart, my heart, my heart, my heart Oh, all I need to do is just hear a single word from you I open up I open up Open up my heart Just one word could make a difference in what I do, Lord Guide me until I'm sure I open I open I open I open my heart You just say one word, one word, one word, one word, one word I A. Holly O'Pea. B. Billy O' Tea. C. Silly O'Sea. D. Willy O'Sea. Open up Your Heart (And Let the Sunshine in) Lyrics by The McGuire Sisters from the By Request album- including song video, artist biography, translations and more: Mommy told me something A little kid should know It's all about the devil And I've learned to hate him so .