Following the course of the river, he at length arrived at the gates of Paradise. The gates were shut. He knocked, and, with his usual impetuosity, demanded admittance. "Thou canst not be admitted here," exclaimed a voice from within; "this gate is the Lord's." "I am the Lord--the Lord of the earth," rejoined the impatient chief. "I am Alexander the Conqueror. Will you not admit _me_?" "No," was the answer; "here we know of no conquerors, save such as conquer their passions: _None but the just can enter here_." Alexander endeavoured in vain to enter the abode of the blessed--neither entreaties nor menaces availed. Seeing all his attempts fruitless, he addressed himself to the guardian of Paradise, and said: "You know I am a great king, who has received the homage of nations. Since you will not admit me, give me at least some token that I may show an astonished world that I have been where no mortal has ever been before me." "Here, madman," said the guardian of Paradise--"here is something for thee. It may cure the maladies of thy distempered soul. One glance at it may teach thee more wisdom than thou hast hitherto derived from all thy former instructors. Now go thy ways." Alexander took the present with avidity, and repaired to his tent. But what was his confusion and surprise to find, on examining his present, that it was nothing but a fragment of a human skull. "And is this," exclaimed he, "the mighty gift that they bestow on kings and heroes? Is this the fruit of so much toil and danger and care?" Enraged and disappointed, he threw it on the ground. "Great king," said one of the learned men who were present, "do not despise this gift. Contemptible as it may appear in thine eyes, it yet possesses some extraordinary qualities, of which thou mayest soon be convinced, if thou wilt but cause it to be weighed against gold or silver." Alexander ordered this to be done. A pair of scales were brought. The skull was placed in one, a quantity of gold in the other; when, to the astonishment of the beholders, the skull over-balanced the gold. More gold was added, yet still the skull preponderated. In short, the more gold there was put in the one scale the lower sank that which contained the skull. "Strange," exclaimed Alexander, "that so small a portion of matter should outweigh so large a mass of gold! Is there nothing that will counterpoise it?" "Yes," answered the philosophers, "a very little matter will do it." They then took some earth and covered the skull with it, when immediately down went the gold, and the opposite scale ascended. "This is very extraordinary," said Alexander, astonished. "Can you explain this phenomenon?" "Great king," said the sages, "this fragment is the socket of a human eye, which, though small in compass, is yet unbounded in its desires. The more it has, the more it craves. Neither gold nor silver nor any other earthly possession can ever satisfy it. But when it