On the Sacrifice of Abel and Cain (109-111)

But the first fruits are the holy motions of each in accordance with virtue; on which account they have been compared to a threshing-floor. As, therefore, on a threshing-floor there is wheat and barley, and as many more of such things as are capable of being separated by themselves, and husks and chaff, and whatever other refuse is dissipated and scattered in different directions, so too, with us, there are some things which are excellent and useful, and which afford real nourishment, by means of which a good life is brought to perfection; all which things we should attribute to God. But there are other things which are not divine, which we must leave like refuse to the race of mankind; but from these some portions must be taken away,

and there are some entire virtues, free from all wickedness, which it would be impious to mutilate by dividing them, and which resemble those indivisible sacrifices, the whole burnt-offerings, of which Isaac is a manifest pattern, whom his father was commanded to offer up like a victim, sharing in no destructive passion.

And in another passage it is said, "My gifts, and my offerings, and my sacrifices, ye will take care to offer to me at my festivals:" not taking away from them, nor dividing them, but bringing them forward full, and entire, and perfect; for the feast of the soul is cheerfulness in perfect virtues; and [*]