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Now, the Pole Star is a sensible reality, and so too is its ascension, that is, the fact that the closer one goes to the Pole, the higher the Pole Star rises. And from these two known realities an unknown reality is discovered, namely, that the heavens are inclined, meaning that the sky above the horizon at each latitude is different from that at another latitude. Man comprehends this relation and reasons from it a previously unknown thing, namely, the curvature of the earth. But this comprehension is impossible for the animal. It is likewise impossible for the animal to comprehend that the sun is the centre and that the earth revolves around it. The animal is a prisoner of the senses and is circumscribed by them: It cannot comprehend anything that lies beyond the reach or control of the senses, even though it excels man in the outward powers and senses. It is therefore clearly established that man is endowed with a power of discovery that distinguishes him from the animal, and this power is none but the human spirit
(48:7)
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