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What a difference between the world of man and the world of the animal! What a difference between the loftiness of man and the abasement of the animal, between the perfections of man and the ignorance of the animal, between the light of man and the darkness of the animal, between the glory of man and the degradation of the animal! An Arab child of ten years can subdue two or three hundred camels in the desert and lead them about with his mere voice. A feeble Indian can so subdue a mighty elephant as to compel it to move in strict obedience. All things are subdued by the hand of man, who withstands nature itself (48:9) All other beings are captives of nature and cannot free themselves from its exigencies: Man alone can withstand nature. So nature attracts all bodies to the centre of the earth, but through mechanical means man moves away from it and soars in the air; nature prevents man from crossing the sea, but man builds ships and traverses the heart of the great ocean, and so forth- the subject is endless. For example, man traverses mountains and plains in vehicles and gathers in one place the news of the events of East and West. This is how man withstands nature. The sea in all its vastness cannot deviate one iota from the rule of nature; the sun in all its greatness cannot stray so much as a needle's point from the rule of nature, nor can it ever comprehend the states, conditions, properties, movements, and nature of man. What then is the power residing in man's puny form that encompasses all this? What conquering power is this that subdues all things? (48:10) One more point remains. Modern philosophers say: "Nowhere do we see a spirit in man, and, although we have investigated the inmost recesses of the human body, nowhere do we perceive a spiritual power. How then are we to imagine a power which is not sensible?" The divine philosophers reply: "The spirit of the animal is not sensible either and cannot be perceived through our material powers: How do you infer its existence? There is no doubt that it is from its effects that you infer in the animal the existence of a power which is lacking in the plant, and that is the power of the senses- sight, hearing, and the other powers. It is from these that you infer that there is an animal spirit. Infer, likewise, from the aforementioned signs and arguments the existence of a human spirit. Thus, since there are signs in the animal that cannot be found in the plant, you say that this sensory power is one of the hallmarks of the animal spirit. You see likewise in man signs, powers, and perfections that do not exist in the animal: Infer then that there is a power in him of which the animal is bereft." (48:11) If we were to deny all that is not accessible to the senses, then we would be forced to deny realities which undoubtedly exist. For example, the ether is not sensible, although its reality can be proven. The power of gravity is not sensible, although its existence is likewise undeniable. Whence do we affirm their existence? From their signs. For instance, this light consists in the vibrations of the ether, and from these vibrations we infer its existence
(48:12)
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