prothymia
From LSJ
μὴ τὴν ὄψιν καλλωπίζου, ἀλλ' ἐν τοῖς ἐπιτηδεύμασιν ἴσθι καλός → Don't beautify your face, but be beautiful in your habits (Thales, in Diog. Laertius 1.37)
Latin > English (Lewis & Short)
prŏthȳmĭa: ae, f., = προθυμία,
I readiness, willingness, inclination, Plaut. Stich. 4, 2, 53; 5, 2, 11; Marc. Aur. ap. Front. Ep. 2, 5 Mai.