When I speak of good hearing, I do not mean listening to others; I mean simply listening to yourself. When I speak of good eyesight, I do not mean looking at others; I mean simply looking at yourself. He who does not look at himself but looks at others, who does not get hold of himself but gets hold of others, is getting what other men have got and failing to get what he himself has got. He finds joy in what brings joy to other men, but finds no joy in what would bring joy to himself.

The Complete Works of Chuang Tzu