Death is natural, like birth. Marcus Aurelius 4.5

Marcus advises us to expect death, so that we meet her calmly, and with good cheer, accepting her as a necessary part of the mystery of life. As we accept birth, another natural accident beyond our power, so we should accept death.

Ὁ θάνατος τοιοῦτον, οἷον γένεσις, φύσεως μυστήριον· σύγκρισις ἐκ τῶν αὐτῶν στοιχείων, εἰς ταὐτὰ λύσις. ὅλως δὲ οὐκ ἐφ᾽ ᾧ ἄν τις αἰσχυνθείη· οὐ γὰρ παρὰ τὸ ἑξῆς τῷ νοερῷ ζῴῳ οὐδὲ παρὰ τὸν λόγον τῆς κατασκευῆς.

Death is a thing like birth, a mystery of nature. Birth is a combination of the same elements whose association death dissolves. It is certainly nothing to be ashamed or afraid of. The rational animal encounters it as something ordinary and expected, a regular milestone on life's way.