Plato, Laws 803c

πάνυ μὲν οὖν. φημὶ χρῆναι τὸ μὲν σπουδαῖον σπουδάζειν, τὸ δὲ μὴ σπουδαῖον μή, φύσει δὲ εἶναι θεὸν μὲν πάσης μακαρίου σπουδῆς ἄξιον, ἄνθρωπον δέ, ὅπερ εἴπομεν ἔμπροσθεν, θεοῦ τι παίγνιον εἶναι μεμηχανημένον, καὶ ὄντως τοῦτο αὐτοῦ τὸ βέλτιστον γεγονέναι· τούτῳ δὴ δεῖν τῷ τρόπῳ συνεπόμενον καὶ παίζοντα ὅτι καλλίστας παιδιὰς πάντʼ ἄνδρα καὶ γυναῖκα οὕτω διαβιῶναι, τοὐναντίον ἢ νῦν διανοηθέντας.

I may be faced—and rightly faced—with the question, What do I mean by this? Certainly. What I assert is this,—that a man ought to be in serious earnest about serious things, and not about trifles; and that the object really worthy of all serious and blessed effort is God, while man is contrived, as we said above, to be a plaything of God, and the best part of him is really just that; and thus I say that every man and woman ought to pass through life in accordance with this character, playing at the noblest of pastimes, being otherwise minded than they now are.