The sciences of only one nation, the Greeks, have come down to us, because they were translated through Al-Ma'mun's efforts. He was successful in thi… - Ibn Khaldun

It should be known that at the beginning of a dynasty, taxation yields a large revenue from small assessments. At the end of the dynasty, taxation yields a small revenue from large assessments.

Eventually, Aristotle appeared among the Greeks. He improved the methods of logic and systematized its problems and details. He assigned to logic its proper place as the first philosophical discipline and the introduction to philosophy. Therefore he is called the First Teacher.

Arabic writing at the beginning of Islam was, therefore, not of the best quality nor of the greatest accuracy and excellence. It was not (even) of medium quality, because the Arabs possessed the savage desert attitude and were not familiar with crafts. One may compare what happened to the orthography of the Qur’an on account of this situation. The men around Muhammad wrote the Qur’an in their own script which, was not of a firmly established, good quality. Most of the letters were in contradiction to the orthography required by persons versed in the craft of writing.... Consequently, (the Qur’anic orthography of the men around Muhammad was followed and became established, and the scholars acquainted with it have called attention to passages where (this is noticeable). No attention should be paid in this connection with those incompetent (scholars) that (the men around Muhammad) knew well the art of writing and that the alleged discrepancies between their writing and the principles of orthography are not discrepancies, as has been alleged, but have a reason. For instance, they explain the addition of the alif in la ‘adhbahannahU "I shall indeed slaughter him" as indication that the slaughtering did not take place ( lA ‘adhbahannahU ). The addition of the ya in bi-ayydin "with hands (power)," they explain as an indication that the divine power is perfect. There are similar things based on nothing but purely arbitrary assumptions. The only reason that caused them to (assume such things) is their belief that (their explanations) would free the men around Muhammad from the suspicion of deficiency, in the sense that they were not able to write well. They think that good writing is perfection. Thus, they do not admit the fact that the men around Muhammad were deficient in writing.