3 But why, you ask me, have I thus mentioned Varro and the man of brass? Simply to bring to your notice our Christian man of brass, or, rather, man of adamant — Origen, I mean— whose zeal for the study of Scripture has fairly earned for him this latter name. Would you learn what monuments of his genius he has left us? The following list exhibits them. His writings comprise thirteen books on Genesis, two books of Mystical Homilies, notes on Exodus, notes on Leviticus, * * * * also single books, four books on First Principles, two books on the Resurrection, two dialogues on the same subject.
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Source: Letters (New Advent)