ἐπιτηδευτέον
From LSJ
καὶ κεραμεὺς κεραμεῖ κοτέει καὶ τέκτονι τέκτων, καὶ πτωχὸς πτωχῷ φθονέει καὶ ἀοιδὸς ἀοιδῷ → and potter is ill-disposed to potter, and carpenter to carpenter, and the beggar is envious of the beggar, the singer of the singer
English (LSJ)
one must pursue, Pl.Lg. 858d. Adj. ἐπιτηδευτέος, ἐπιτηδευτέα, ἐπιτηδευτέον, to be pursued, Plu.2.10b.
Greek (Liddell-Scott)
ἐπιτηδευτέον: ῥημ. ἐπίθ. τοῦ ἐπιτηδεύω, δεῖ ἐπιτηδεύειν, Πλάτ. Νόμ. 858D.