There are traces of attempts at a methodical explanation of biblical texts before the appearance of full-scale commentaries on Holy Scripture. The use of exegetical technical forms arose in Christian schools from the necessity to understand the contents of the Bible as coherent. In Clement of Alexandria, exc. Theod. 4f, a hitherto overlooked fragment of an early Christian Quaestiones-commentary has been preserved. The specific interest in Christ's transfiguration concerns his identity with God and the comprehension of his disciples. The differences between heretical and orthodox exegesis do not depend on the choice of methods, as Marc the Magician and Clement demonstrate. The narrative of the transfiguration in the apocryphal Acts of the Apostles testifies to exegetical expertise. Origen considers his own scholarly exegesis as basically debatable.