Master (καθηγητής kathēgētēs)

Do not be called ‘master’; you have but one Master, the Christ. (Mt 23:10)

μηδὲ κληθῆτε καθηγηταί, ὅτι καθηγητὴς ὑμῶν ἐστιν εἷς ὁ χριστός.

Nec vocemini magistri: quia Magister vester unus est, Christus.