Catena Aurea on Luke 7:29–35: Gregory of Nyssa

But singing and lamentation are nothing else but the breaking forth, the one indeed of joy, the other of sorrow. Now at the sound of a tune played upon a musical instrument, man by the concordant beating of his feet, and motion of his body, pourtrays his inward feelings. Hence he says, We have sung, and ye have not danced; we have mourned to you, and ye have not wept.