By Allan Menzies.
Though Origen was the first great interpreter of Scripture in the Church, commentaries had been written before his. He speaks of those who had preceded him in this activity; and though but little survives of the labours of these earlier expositors, we know that the work of commenting on Scripture was zealously carried on in the Gnostic churches in the latter part of the second century, and several of the older exegetes in the Church are also known to us by name and reputation. Heracleon the Gnostic commentator on John, who is often cited and often rather unfairly dealt with by Origen, as he follows him over the same ground, belonged to the Valentinian school. Many of his comments the reader will find to be very just and shrewd; but the tenets of his school led him into many extravagances. Of Pantaenus, head of the catechetical school at Alexandria in the end of the second and early years of the third century, we hear that he interpreted many of the books of Scripture. We also learn that he preceded Clement and Origen, his successors in office, in the application of Gentile learning to Christian studies; the broad and liberal tone of Alexandrian theology may be due in part to his influence. Much of his exegetical work was still extant in the days of Jerome, who, however, reports that he did more for the Church as a teacher than as a writer. Only fragments of his Commentaries now remain. In Clement's works, on the contrary, we find, if not any set commentaries, various extended discussions of particular texts. We also find in him a theory of Scripture, its inspiration and its nature, which is followed also by Origen, and which determines the whole character of Alexandrian exegesis. In accordance with the general tendency of that age, which witnessed a reaction from the independence of philosophy and an appeal in many quarters to the authority of ancient oracles and writings, the Alexandrian school treats Scripture as an inspired and infallible storehouse of truth,--of truth, however, not patent to the simple reader, but requiring the spiritual man to discern its mystic import.
Reference address : https://www.ellopos.net/elpenor/greek-texts/fathers/origen/commentaries-introduction.asp?pg=2