ἐπ' ἀγαθῷ

From LSJ

διφθέραι σταδιαῖαι τοῖς μεγέθεσιν → hides a stade in size, hides fastened together so as to cover a place an entire stadium in extent

Source

Greek > English (Woodhouse)

for the good of

Spanish

para bien, favorablemente