§12.28.1Πρὸς τοὺς ἐπιζητοῦντας· ποῦ γὰρ ἰδὼν τοὺς θεοὺς ἢ πόθεν κατειληφὼς ὅτι εἰσὶν οὕτως σέβεις; πρῶτον μὲν καὶ ὄψει ὁρατοί εἰσιν· ἔπειτα μέντοι οὐδὲ τὴν ψυχὴν τὴν ἐμαυτοῦ ἑώρακα καὶ ὅμως τιμῶ·
To those who ask: "Where have you seen the gods, or from what source have you comprehended that they exist, that you worship them so?" First, they are visible even to the eyes; secondly, I have not seen my own soul either, and yet I honor it.
οὕτως οὖν καὶ τοὺς θεούς, ἐξ ὧν τῆς δυνάμεως αὐτῶν ἑκάστοτε πειρῶμαι, ἐκ τούτων ὅτι τε εἰσὶ καταλαμβάνω καὶ αἰδοῦμαι.
So too with the gods: from those things in which I experience their power at every moment, from these I comprehend that they exist, and I revere them.