ἀγεωμέτρητος μηδεὶς εἰσίτω → no one ignorant of geometry may enter, let no one ignorant of geometry enter, let no one ignorant of geometry come in
ἄφνωunforeseen, sudden, Aesch., Thuc.:—adv. -ίως, Thuc.; also -ιον, Plut.