εἰ… γονάτων ἀπώσαιτ' ἄλγος αὖ προσθείμεθ' ἄν

From LSJ

ὃν οἱ θεοὶ φιλοῦσιν ἀποθνήσκει νέος → he whom the gods love dies young, only the good die young

Source