ἐὰν ἀεὶ κατὰ πρύμναν ἱστῆται τὸ πνεῦμα

From LSJ

τὸν ἰητρὸν δοκέει μοι ἄριστον εἶναι πρόνοιαν ἐπιτηδεύειν → it appears to me a most excellent thing for the physician to cultivate prognosis

Source

English > Greek (Woodhouse Quotes Reversed)

if the wind is always favourable