  We are fortunate in having a list of titles of works ascribed to al-Kindi, which is found in the Fihrist of the tenth century bookseller Ibn al-Nadim. Thanks to Ibn al-Nadim we know that al-Kindi wrote hundreds of treatises on a very wide variety of scientific and philosophical disciplines. Indeed the scientific and mathematical titles far outnumber the philosophical titles. Many of the latter would now be lost if not for a single manuscript, held in Istanbul, which contains most of al-Kindi’s extant philosophical writings (edited in Abu Rida 1950 and 1953; several important texts are edited and translated in Rashed and Jolivet 1998). This includes the work for which he is best known, On First Philosophy. Our version of this treatise is incomplete, comprising only the first part, which is divided into four sections. The first section is essentially an exhortation to the reader to honor Greek philosophical wisdom. The second contains al-Kindi’s celebrated discussion of the eternity of the world. The third and fourth establish the existence of a “true One,” i.e. God, which is the source of unity in all other things, and consider the inapplicability of language to this true One.