Abu'l Walid Muhammad Ibn Rushd Al-Qurtubi Quotes
No enemy is more harmful than ignorance.
This was written when Islam was intellectually far more advanced than Christian Europe. This viewpoint was one of the reasons for their advanced civilization. It was held by many. It is still held by many Muslims, but for the fundamentalist of Islam today, ignorance of anything that is not in the Koran or other sayings of the Prophet is a virtue. Madrassas throughout the Islamic world teach only the Koran and religious law and nothing of mathematics, philosophy, science, history and never of other religions.
Abu Abdullah Muhammad al-Harithi al-Baghdadi al-Mufid, 10th Century, Iraqi Jurist and Scholar, Writings
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Abu 'Abd Allah Muhammad ibn Muhammad ibn al-Nu'man al-'Ukbari al-Baghdadi, known as al-Shaykh al-Mufid and Ibn al-Mu'allim (c. 948–1022 CE), was a prominent Twelver Shia theologian. His father was a teacher (mu'allim), hence the name Ibn al-Mu'allim. The title "al-Mufid" was given to him either by Muhammad al-Mahdi, the twelfth Shia Imam, or by al-Rummani, a Sunni scholar, after a conversation with him. The leader of the Shia community, he was a mutakallim, theologian, and Shia jurist.