De Sacrificiis Abelis Et Caini

Now both these opinions were brought forth by one soul. But it follows of necessity that as soon as they were born they must have been separated; for it was impossible for enemies to dwell together for ever. Until then the soul brought forth the God-loving doctrine Abel, the self-loving Cain dwelt with her. But when she brought forth Abel, or unanimity with God, she abandoned unanimity with that mind which was wise in its own conceit.