Meditations 2.9.1

Τούτων ἀεὶ δεῖ μεμνῆσθαι, τίς ἡ τῶν ὅλων φύσις καὶ τίς ἡ ἐμὴ καὶ πῶς αὕτη πρὸς ἐκείνην ἔχουσα καὶ ὁποῖόν τι μέρος ὁποίου τοῦ ὅλου οὖσα καὶ ὅτι οὐδεὶς ὁ κωλύων τὰ ἀκόλουθα τῇ φύσει, ἧς μέρος εἶ, πράσσειν τε ἀεὶ καὶ λέγειν.

Always remember what the nature of the whole is, what my own nature is, how my nature stands in relation to it, and what kind of part it is of what kind of whole. Remember also that no one can prevent you from always doing and saying what accords with the nature of which you are a part.