φιλοπονία
From LSJ
ὁ δ' εὖ ἔρδων θεοὺς ἐλπίδι κυδροτέρᾳ σαίνει κέαρ → but he who does well to the gods cheers his heart with a more glorious hope
English (LSJ)
ἡ,
A love of labour, industry, Pl.R.535d, Stoic.3.64, 171, Phld.Rh.1.115 S., TAM2(1).283 (Xanthus); καρτερία καὶ φ. Pl.Alc.1.122c; ἡ περὶ τὴν παιδείαν φ. Isoc. 1.45; pl., Id.15.291, Plb.8.10.6, etc.; ἡ τῶν δρόμων φ. laborious practice of... D.61.24; φ. ἐν τοῖς γυμνασίοις ib.26; so, as an event in competitions of ἔφηβοι, SIG1061.5 (Samos, ii A. D.).
German (Pape)
[Seite 1284] ἡ, Liebe, Lust zur Arbeit, Arbeitsamkeit; Plat. Rep. VII, 535 c; καὶ καρτερία Alc. I, 122 c; περί τι, Isocr. 1, 45; Pol. 8, 12, 6.