a. The first of the teachers of the catechetical school at Alexandria known by name was =Pantænus=, who had formerly been a Stoic philosopher. About A.D. 190 he undertook a missionary journey into Southern Arabia or India, and died in A.D. 202 after a most successful and useful life. Jerome says of him: _Hujus multi quidem in s. Scri. exstant Commentarii, sed Magis viva voce ecclesiis profuit_. Of his writings none are preserved. b. =Titus Flavius Clemens [Clement]= was the pupil of Pantænus and his successor at the catechetical school in Alexandria. On his travels undertaken in the search for knowledge he came to Alexandria as a learned pagan philosopher, where probably Pantænus gained an influence over him and was the means of his conversion. During the persecution under Septimius Severus in A.D. 202 he sought in flight to escape the rage of the heathens, in accordance with Matt. x. 23. But he continued unweariedly by writing and discourse to promote the interests of the church till his death in A.D. 220. The most important and most comprehensive of his writings is the work in three parts of which the first part entitled Λόγος προτρεπτικὸς πρὸς Ἕλληνας (_Cohortatio ad Græcos_) with great expenditure of learning seeks to prepare the minds of the heathen for Christianity by proving the vanity of heathenism; the second part, Ὁ παιδαγωγός in three books, with a _Hymnus in Salvatorem_ attached, gives an introduction to the Christian life; and the third part, Στρωματείς (_Stromata_), that is, patchwork, so-called from the aphoristic style and the variety of its contents, in eight books, setting forth the deep things of Christian gnosis, but in the form rather of a collection of materials than a carefully elaborated treatise. The little tractate Τίς ὁ σωζόμενος πλούσιος (_Quis dives salvetur_) shows how even wealth may be made contributory to salvation. Among his lost treatises the most important was the Ὑποτυπώσεις in eight books, an expository review of the contents of holy scripture.[73] § 31.5.