Maqasid al Falasifa (Arabic: مقاصد الفلاسفة), or The Aims of the Philosophers was written by Abū Ḥāmid Muḥammad ibn Muḥammad al-Ghazali. Influenced by Avicenna's works, he wrote this book presenting the basic theories of philosophy. In this book, he explained in detail about what philosophy is and described basic entities like judgement, concept, premise and logic. Al-Ghazali stated that one must be well versed in the ideas of the philosophers before setting out to refute their ideas. He also stated that he did not find other branches of philosophy including physics, logic, astronomy or mathematics problematic. After writing Maqasid al Falasifa, he wrote another. book Tahāfut al-Falāsifa, criticizing the Avicennian school of early Islamic philosophy. Source: Wikipedia (en)