Al Kindi
Al Kindi
Of the tribe of Kindah, lived in Basra and Bagdad where he died 873. He is the first of the great Arabian followers of Aristotle whose influence is noticeable in Al Kindi’s scientific and psychological doctrines. He wrote on geometry, astronomy, astrology, arithmetic, music (which he developed on arithmetical principles), physics, medicine, psychology, meteorology, politics. He distinguishes the active intellect from the passive which is actualized by the former. Discursive reasoning and demonstration he considers as achievements of a third and a fourth intellect. In ontology he seems to hypostasize the categories, of which he knows fivematter, form, motion, place, time, and which he calls primary substances. Al Kindi inaugurated the encyclopedic form of philosophical treatises, worked out more than a century later by Avicenna (q.v.). He also was the first to meet the violent hostility of the orthodox theologians but escaped persecution. A. Nagy, Die philos. Abhandlungen des Jacqub ben Ishaq al-Kindi, Beitr, z. Gesch. d. Phil. d. MA. 1897, Vol. II. — R.A.