Gerhard Endress has "revolutionized the study of Medieval Arabic philosophy and science by combining painstaking investigations into its contents and historical development with meticulous systematic studies in its language and terminology based, in turn, on a careful philological examination of its Greek and Syriac sources and the ways and modes of translation and transmission into Arabic" (from the Preface by R. Arnzen - J. Thielmann to the volume Words, Texts and Concepts Cruising the Mediterranean Sea. Studies on the sources, contents and influences of Islamic civilization and Arabic philosophy and science dedicated to Gerhard Endress on his sixty-fifth birthday, Peeters, Leuven 2004).