"Yet both philosophers were also highly cognizant of the need for intellectual rigor. For Ibn al-Arabi, this included a legendary familiarity with the Qurʾan and the hadith corpus, copious references to them in his voluminous writing, a meticulous and critical examination of philosophy (falsafa) and scholastic theology  (kalām), and a pious observation of the shariʿa in his personal life. In Derrida's case, he worked closely with renowned French philosophers and writers of the late 20th century including Althusser, Hyppolite, Marion, Barthes, de Mann, and many North American academics."