The Downside of a Happy Heart

My middle dd who is known as the happy girl in our family, because she is always singing and smiling, recently shared with me the downside of her joy. "Mom," said she, "I have got to quit humming. I really need to. I really try to quit, but I never can. Even at night, mommy, I hum. But I really want to stop!" Of course, my response was, "Why?" To which she matter-of-factly replied, "Because it's hurting my throat!"