The function of emptiness

"Heaven and earth exhibit no benevolence ; to them the ten thousand things are like straw dogs. The holy man exhibits no benevolence ; to him the hundred families are like straw dogs. Is not the space between heaven and earth like unto a bellows ? It is empty; yet it collapses not. It moves, and more and more comes forth. [But] How soon exhausted is A gossip's fulsome talk! And should we not prefer On the middle path to walk?""