96 Abraham, ready to receive strangers, faithful towards God, devoted in ministering, quick in his service, saw the Trinity in a type; he added religious duty to hospitality, when beholding Three he worshipped One, and preserving the distinction of the Persons, yet addressed one Lord, he offered to Three the honour of his gift, while acknowledging one Power. It was not learning but grace which spoke in him, and he believed better what he had not learned than we who have learned. No one had falsified the representation of the truth, and so he sees Three, but worships the Unity. He brings forth three measures of fine meal, and slays one victim, considering that one sacrifice is sufficient, but a triple gift; one victim, an offering of three. And in the four kings, who does not understand that he subjected to himself the elements of the material creation, and all earthly things in a sign whereby the Lord's Passion was prefigured? Faithful in war, moderate in his triumph, in that he preferred not to become richer by the gifts of men, but by those of God.
Source: On the Death of Satyrus (New Advent)