σπουδά
From LSJ
πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
English (Slater)
σπουδά
1 earnestness ἐγὼ δὲ συνεφαπτόμενος σπουδᾷ (O. 10.97) τᾶς εὐδαίμονος ἀμφὶ Κυράνας θέμεν σπουδὰν ἅπασαν (P. 4.276)