It is not exactly a magic phenomenon, but certainly a most startling feature in visions, that the minds of many men should be able, by their own volition, to create images and forms so perfectly like those existing in the world around us, that the same minds are incapable of distinguishing where hallucination and reality touch each other. This faculty varies, of course, as much as other endowments: sometimes it produces nothing but vague, shapeless lights or sounds; in other persons it is capable of calling up well-defined forms, and of causing even words to be heard and pain to be inflicted. During severe suffering in body or soul, it may become a comforter, and in the moment of passing through the valley of the shadow of death, it is apt to soothe the anguish, by visions of heavenly bliss, but to an evil conscience it may also appear as an avenger, by prefiguring impending judgment and condemnation. It is this influence on the lives of men, and their great moral importance, which lends to visions--and in a certain degree even to hallucinations--additional interest, and makes it our duty not to set them aside as mere idle phantoms, but to try to ascertain their true nature and final purpose. This is all the more necessary, as in our day visions are considered purely the offspring of the seer's own mental activity, a truth abundantly proven by the simple fact that blind or deaf people are quite as capable of having visions and hallucinations, as those who have the use of all their senses.