τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life
P. and V. βεβαίως, ἀσφαλῶς, V. ἀραρότως (also Plato but rare P.), V. ἐμπέδως.