Tradition
Gennadius of Marseilles
Illustrious Men (Supplement to Jerome)
Chapter 37
Simplicianus, the bishop, exhorted Augustine then presbyter, in many letters, that he should exercise his genius and take time for exposition of the Scriptures that, as it were, a new Ambrosius, the task master of Origen might appear. Wherefore also he sent to him many examinations of scriptures. There is also an epistle of his of Questions in which he teaches by asking questions as if wishing to learn.
Source: Illustrious Men (Supplement to Jerome) (New Advent)