4406. Since the sight of the eye corresponds to the understanding, sight is therefore attributed to the understanding also, and is called intellectual sight. In addition the things which a person discerns are referred to as the objects of that sight. In everyday language too one speaks of seeing things when one understands them; and one also uses the terms light and enlightenment, and consequently clarity, in reference to the understanding, or conversely shade and darkness, and consequently obscurity. These and other terms like them have entered into a person's use of language because of their correspondence. For his spirit dwells in the light of heaven and his body in the light of the world - it being the spirit which has life within the body and also which thinks. Consequently there are many things of an interior nature which have passed down in this manner into the actual expressions people use.