Make peace with your fate. Marcus Aurelius 4.26

Marcus rehearses how to make decisions. See all of your life when you consider each moment. Don't make the moments last longer than they should, or spend time worrying uselessly about them. Have a simple assessment of what is happening and what you can do to respond. Make your move, and rest content with whatever happens next.

Ἑώρακας ἐκεῖνα, ἴδε καὶ ταῦτα. σεαυτὸν μὴ τάρασσε· ἅπλωσον σεαυτόν. ἁμαρτάνει τις; ἑαυτῷ ἁμαρτάνει. συμβέβηκέ σοί τι; καλῶς· ἐκ τῶν ὅλων ἀπ’ ἀρχῆς σοι συγκαθείμαρτο καὶ συνεκλώθετο πᾶν τὸ συμβαῖνον. τὸ δ’ ὅλον, βραχὺς ὁ βίος· κερδαντέον τὸ παρὸν σὺν εὐλογιστίᾳ καὶ δίκῃ. νῆφε ἀνειμένος (†) .

You have already seen the past. Look now to the present. Don't trouble yourself as you look. Simplify. Is someone else making a mistake? The harm is his, too. Has something happened to you? Good. Everything that happens to you is woven tight and fated, your part of the whole that flows naturally from the source of the universe. Life is brief, when you see all of it at once. Handle your present business with prudence, and with justice. Then let it go, and be at peace.

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(†) Leopold's text offers an adverb (ἀνειμένως), but I prefer the participle (with Farquharson).