Enchiridion · §2

μέμνησο, ὅτι ὀρέξεως ἐπαγγελία ἐστὶ τὸ τυχεῖν οὗ ὀρέγῃ, ἐκκλίσεως δὲ τὸ μὴ περιπεσεῖν ἐκείνῳ ὃ ἐκκλίνεις· καὶ ὁ μὲν ἐν ὀρέξει ἀποτυγχάνων ἀτυχής, ὁ δὲ ἐν ἐκκλίσει περιπίπτων δυστυχής.ἂν μὲν οὖν μόνα ἐκκλίνῃς τὰ παρὰ φύσιν τῶν ἐπὶ σοί, οὐδενὶ ὧν ἐκκλίνεις περιπεσῇ· νόσον δὲ ἂν ἐκκλίνῃς ἢ θάνατον ἢ πενίαν, δυστυχήσεις.ἆρον οὖν τὴν ἔκκλισιν ἀπὸ πάντων τῶν οὐκ ἐφ᾽ ἡμῖν καὶ μετάθες ἐπὶ τὰ παρὰ φύσιν τῶν ἐφ᾽ ἡμῖν. τὴν ὄρεξιν δὲ παντελῶς ἐπὶ τοῦ παρόντος ἄνελε.

memnēso, hoti orexeōs epangelia esti to tuchein hou oregē, ekkliseōs de to mē peripesein ekeinō ho ekklineis; kai ho men en orexei apotugchanōn atuchēs, ho de en ekklisei peripiptōn dustuchēs. an men oun mona ekklinēs ta para phusin tōn epi soi, oudeni hōn ekklineis peripesē; noson de an ekklinēs ē thanaton ē penian, dustuchēseis. aron oun tēn ekklisin apo pantōn tōn ouk eph' hēmin kai metathes epi ta para phusin tōn eph' hēmin.

Remember that desire promises to obtain what you long for, and aversion promises to avoid what you dislike. One who fails in desire is unfortunate; one who falls into what they sought to avoid is miserable. If you confine your aversion only to things contrary to nature that lie within your power, you will never fall into what you try to avoid. But if you try to avoid illness, death, or poverty, you will encounter misery. Remove aversion entirely from things not in our power, and transfer it to what is contrary to nature among things that are in our power.

— Enchiridion 2

Source: Greek (Schenkl/Oldfather critical edition tradition) + Long 1877 English translation