Plato, Epinomis 978c

ὥστʼ ἐννοῆσαι, φύσιν ταύτην ἔχουσιν ἐκ τοῦ παντὸς πρὸς τὸ δυνατοὺς ἐννοεῖν εἶναι; πολλοῖς δὲ ἄλλοις αὖ τῶν ζῴων οὐδʼ εἰς αὐτὸ τοῦθʼ ἡ φύσις παραγέγονεν, ὥστε μαθεῖν δυνατοῖς εἶναι παρὰ τοῦ πατρὸς ἀριθμεῖν, παρὰ δʼ ἡμῖν τοῦτʼ αὐτὸ πρῶτον ἐνῴκισεν ὁ θεός, ὥστε ἱκανοῖς εἶναι δεικνύμενον συννοεῖν, ἔπειτʼ ἔδειξεν καὶ δείκνυσιν· ὧν τί κάλλιον ἓν ἑνὸς ἄν τις θεάσαιτο πλὴν τὸ τῆς ἡμέρας γένος, εἶτα εἰς τὸ τῆς νυκτὸς ἔλθοι μέρος ἔχων ὄψιν, ὅθεν ἕτερον πᾶν αὐτῷ

we have from the All to enable us to conceive of their existence? Then again, many other living creatures are not endowed by nature even to the actual point of being able to learn from their father to count; whereas in us, in the first place, God implanted this very conception, so that we might be equal to comprehending it when shown to us, and in the second place, he showed it and shows it. Among such things, what one more singularly beautiful can a man behold than the world of day? Then he comes to the province of night, and views it; and there quite another sight