III 37.19
Certainly, we are aware that this venerable man Sanctulus did not obtain even a basic education. He did not know the precepts of the law. Yet because "love (caritas) is the fulfilling of the law" (Rm 13:10), he served the whole law in love (dilectio) of God and [his] neighbour, and that which outwardly lacked in knowledge, he inwardly lived in love (amor). And he who perhaps never read what John the Apostle said of our Saviour: "because he laid down his life for us: and we ought to lay down our lives for the brethren" (Jn 3:16), so eminently knew the precept of the Apostle in practice rather than in theory.
(trans. Gardner 1911: 171; modified by J. Szafranowski)