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The Faculty of Vision.—During the whole of the Middle Ages it was believed that the real distinguishing trait of higher men was the faculty of having visions—that is to say, of having a grave mental trouble. And, in fact, the rules of life of all the higher natures of the Middle Ages (the religiosi) were drawn up with the object of making man capable of vision! Little wonder, then, that the exaggerated esteem for these half-mad fanatics, so-called men of genius, has continued even to our own days. “They have seen things that others do not see”—no doubt! and this fact should inspire us with caution where they are concerned, and not with belief!