Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
sibus: callidus sive acutus, Fest. p. 336 Vahl.; cf. persibus.
sĭbus, a, um, fin, avisé : P. Fest. 336, 3 ; v. persibus.
sibus, a, um, scharfsinnig, gescheit, schlau, Paul. ex Fest. 336, 3.
