From Aulus Gellius, Attic Nights Book 13
17. That humanitas does not mean that which the common people believe it does but those who speak more properly use this word with a different meaning.
“Those who have spoken Latin and have used it correctly do not give the word humanitas the meaning which it commonly acquires, one equivalent to Greek philanthropia, indicating a certain kindly disposition and well-wishing toward all men indiscriminately. No, in correct use, humanitas means what the Greeks call paideia, what we have called education and training in the noble arts—these are the arts through which, when men learn them, they become most humanized. For the pursuit of this knowledge and the discipline derived from it has been given alone to mankind of all the animals—this is what it is called humanitas.
This is the way in which older writers use the word and among them especially Marcus Varro and Marcus Tullius, as nearly all the books show. I therefore consider it enough to offer a single example. So, I quote hear the words from Varro’s first book of Human Antiquities, whose beginning goes like this: “Praxiteles, who thanks to his unparalleled artwork, is famous to anyone who has a little bit of liberal learning [humaniori].” Varro, here, does not use humaniori in a colloquial sense, as “easy-going, kind, or friendly, without knowledge of letters”—this meaning does not at all match his statement. What he means with it is a “man of some learning and training” who would know who Praxiteles was from books and spoken accounts.”
XVII. “Humanitatem” non significare id, quod volgus putat, sed eo vocabulo, qui sinceriter locuti sunt, magis proprie esse usos.
Qui verba Latina fecerunt quique his probe usi sunt, “humanitatem” non id esse voluerunt, quod volgus existimat quodque a Graecis philanthropia dicitur et significat dexteritatem quandam benivolentiamque erga omnis homines promiscam, sed “humanitatem” appellaverunt id propemodum, quod Graeci paideian vocant, nos eruditionem institutionemque in bonas artis dicimus. Quas qui sinceriter cupiunt adpetuntque, hi sunt vel maxime humanissimi. Huius enim scientiae cura et disciplina ex universis animantibus uni homini datast idcircoque “humanitas” appellata est.
Sic igitur eo verbo veteres esse usos et cumprimis M. Varronem Marcumque Tullium omnes ferme libri declarant. Quamobrem satis habui unum interim exemplum promere. III. Itaque verba posui Varronis e libro rerum humanarum primo, cuius principium hoc est: “Praxiteles, qui propter artificium egregium nemini est paulum modo humaniori ignotus”. IV. “Humaniori” inquit non ita, ut vulgo dicitur, facili et tractabili et benivolo, tametsi rudis litterarum sit – hoc enim cum sententia nequaquam convenit -, sed eruditiori doctiorique, qui Praxitelem, quid fuerit, et ex libris et ex historia cognoverit.