Even in the cases in which everything would seem to indicate that only one party is giving and offering, and the other only receiving and taking (for example, in the case of a physician giving treatment, a teacher teaching, parents supporting and bringing up their children, a benefactor helping the needy), in reality the one who gives is always also a beneficiary.
Commius autem sive expiato suo dolore sive magna parte amissa suorum legatos ad Antonium mittit seque et ibi futurum, ubi praescripserit, et ea facturum, quae imperarit, obsidibus firmat; unum illud orat, ut timori suo concedatur, ne in conspectum veniat cuiusquam Romani.vatican.va vatican.va