A human being has so many skins inside, covering the depths of the heart. We know so many things, but we don't know ourselves! Why, thirty or forty skins or hides, as thick and hard as an ox's or bear's, cover the soul. Go into your own ground and learn to know yourself there.
Johannes Eckhart (1260-1328), also known as Eckhart von Hochheim and widely refered to as Meister Eckhart, was a German theologian, philosopher and mystic, born near Erfurt, in Thuringia. Meister is German for "Master", referring to the academic title he obtained in Paris.