To his most beloved lord and holy brother and fellow priest, Jerome, who is worthy of honor in the heart of Christ, Augustine sends greetings in the Lord.
1. I had already sent a lengthy letter to Your Charity, replying to that letter of yours to me that you mention that you sent through your holy son, Asterius, who is now not only my brother, but my colleague. I still do not know whether it managed to reach you, except that you write by means of the most sincere brother, Firmus [...].
36. I think that I have replied sufficiently, in fact perhaps more than sufficiently to your three letters; of these I received two by means of Cyprian and one by means of Firmus.
(trans. R. Teske, slightly modified)