молодой человек

From LSJ

ἐὰν ᾖς φιλομαθής, ἔσει πολυμαθής → if you are studious, you will become learned

Source

Russian > Greek

νέος, νεανίσκος, νεηνίσκος, νεανίας, νεηνίης, μειράκιον