《论衡·卷二十·论死篇》
人之所以能够言语，是由于有气力。气力旺盛，是由于能够饮食。
人之所以能言语者，以有气力也，气力之盛，以能饮食也。
The reason why a person is able to speak is because he has energy. When one's energy is exuberant, this is because one is able to eat and drink.