ἐπ' ἀγαθῷ

From LSJ

ὀφθαλμοὶ γὰρ τῶν ὤτων ἀκριβέστεροι μάρτυρες → the eyes are more accurate witnesses than the ears, the eyes are more exact witnesses than the ears

Source

Greek > English (Woodhouse)

for the good of

Spanish

para bien, favorablemente