Please forgo any watery sorries.
You might note the common Hellenistic epitaph, Non fui, fui, non sum, non curo. (I was not, I was, I am not, I don't care.)
Or the even more familiar phrase adorning countless ancient tombs, memento mori (Remember you are dying), which resembles nothing so much as a hard-hearted Hallmark card.
Or consider Mobb Deep's memento mori passing in the guise of a threat: You're better off stickin' yourself; you need to stop frontin'.