τὸ συμφέρον

From LSJ

Μέμνησο νέος ὤν, ὡς γέρων ἔσῃ ποτέ → Iuvenis memento te fore aliquando senem → Bedenke jung schon, dass dereinst ein Greis du bist

Menander, Monostichoi, 354

Greek > English (Woodhouse)

advantage, expediency, interest, interests, one's interests