Fronto, Letters to Friends 1.4 (Ambr. 308):

“Greetings to Aegrilius,

If you trust me at all, I comment to you Julius Aquilinus, a man most learned, most articulate, fantastically trained by the disciplines of philosophy for the best arts, and shaped by the study of eloquence to a peerless ability to speak. It is right that so very serious and wise a man should receive from you, a man as learned and serious, not only protection but promotion and respect.

Aquilinus is also—if you trust my opinion—a man of the kind of character that he must be considered an ornament to you no less than he has been to me. You will not doubt that what I say is true once you take the time to hear him speak about Platonic doctrine.

Thanks to your wisdom and intelligence, you will see that he is not inequal to his impressive fame, thanks to his immense wealth in the finest words and the great flood of his thoughts. Once you have understood that this is true, be warned that there is more to this man’s character still since his honesty and his modesty are so great. The greatest crowds of people came together to hear him at Rome on many occasions.”

Aegrilio Plariano salutem.

Iulium Aquilinum virum, si quid mihi credis doctis|simum facundissimum, philosophiae disciplinis ad optimas artes, eloquentiae studiis ad egregiam facundiam eximie eruditum, commendo tibi quam possum studiosissime. Decet a te gravissimo et sapientissimo viro tam doctum tamque elegantem virum non modo protegi sed etiam provehi et illustrari. Est etiam, si quid mihi credis, Aquilinus eiusmodi vir ut in tui ornamentis aeque ac nostri merito numerandus sit. Non dubitabis ita esse ut dico, si eum audire disputantem de Platonicis disciplinis dignatus fueris. Perspicies pro tua prudentia intellegentiaque summa <non> minorem fama, lucu lentissimum verborum adparatu, maxima frequentia sententiarum. Quom haec ita esse deprehenderis, scito amplius esse in hominis moribus, tanta probitate est et verecundia: maximi concursus ad audiendum eum Romae saepe facti sunt.