Enchiridion · §4

ὅταν ἅπτεσθαί τινος ἔργου μέλλῃς, ὑπομίμνησκε σαυτόν, ὁποῖόν ἐστι τὸ ἔργον. ἐὰν λουσόμενος ἀπίῃς, πρόβαλλε σαυτῷ τὰ γινόμενα ἐν βαλανείῳ, τοὺς ἀπορραίνοντας, τοὺς ἐγκρούοντας, τοὺς λοιδοροῦντας, τοὺς κλέπτοντας· καὶ οὕτως ἀσφαλέστερον ἅψῃ τοῦ ἔργου, ἐὰν ἐπιλέγῃς εὐθύς, ὅτι "λούσασθαι θέλω καὶ τὴν ἐμὴν προαίρεσιν κατὰ φύσιν ἔχουσαν διατηρῆσαι".

hotan haptesthai tinos ergou mellēs, hupomimnēske sauton, hopoion esti to ergon. ean lousomenos apiēs, proballe sautō ta ginomena en balaneiō, tous aporrhainontas, tous enkrountas, tous loidorountas, tous kleptontas; kai houtōs asphalesteron hapsē tou ergou, ean epilegēs euthus, hoti 'lousasthai thelō kai tēn emēn proairesin kata phusin echousan diatērēsai'.

When you are about to undertake some action, remind yourself what kind of action it is. If you are going to bathe, picture to yourself what typically happens at the baths — the splashing, the jostling, the rude remarks, the theft. You will then set about the task more safely if you say at once: 'I want to bathe, and I also want to keep my will in accord with nature.' Do this with every action.

— Enchiridion 4

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