Enchiridion · §41

ἀφυΐας σημεῖόν ἐστι τὸ πολὺν χρόνον τοῖς τοῦ σώματος ἐνδιατρίβειν, ὥσπερ πολλὴν ἄσκησιν ποιεῖσθαι, πολλὴν ἐσθίειν, πολλὴν πίνειν, πολὺ ἀφοδεύειν, πολὺ συγκοιμᾶσθαι. ἀλλὰ ταῦτα ἐν παρέργῳ ποιητέον· πᾶσαν δὲ ἐπιστροφὴν πρὸς τὴν γνώμην ποιητέον.

aphuias sēmeion esti to polun chronon tois tou sōmatos endiatribein, hōsper pollēn askēsin poiesthai, pollēn esthiein, pollēn pinein, polu aphodeuein, polu sunkoimasthai. alla tauta en parergō poiēteon; pasan de epistrophēn pros tēn gnōmēn poiēteon.

It is a sign of a poor natural disposition to spend much time on bodily concerns — excessive exercise, eating, drinking, elimination, and sex. These things should be done in passing; direct your full attention toward the mind.

— Enchiridion 41

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