1CO 14:15

15 So I will tell you [RHQ] what we should do. [At times] we may pray, [using] only our spirits, [in languages we have not learned. And at other times] we should pray using our minds, [thinking about the words that we are praying. Similarly], at times we may sing using only our spirits, using languages that we have not learned, and at other times we should sing using our minds, [thinking about the words that we are singing].