It is possible to provide security against other ills, but as far as death is concerned, we men live in a city without walls.

Epicurus (341-270 BC) Greek philosopher

The Vatican Collection of Epicurean Sayings [Sententiae Vaticanae], #31
    (Source)

Alt. trans.: "One can attain security against other things, but when it comes to death all men live in a city without walls."