Plato, Laws 893b

ἄγε δή, θεὸν εἴ ποτε παρακλητέον ἡμῖν, νῦν ἔστω τοῦτο οὕτω γενόμενον—ἐπί γε ἀπόδειξιν ὡς εἰσὶν τὴν αὑτῶν σπουδῇ πάσῃ παρακεκλήσθων—ἐχόμενοι δὲ ὥς τινος ἀσφαλοῦς πείσματος ἐπεισβαίνωμεν εἰς τὸν νῦν λόγον. καί μοι ἐλεγχομένῳ περὶ τὰ τοιαῦτα ἐρωτήσεσιν τοιαῖσδε ἀσφαλέστατα ἀποκρίνεσθαι φαίνεται κατὰ τάδε· ὦ ξένε, ὁπόταν φῇ τις, ἆρα ἕστηκε μὲν πάντα, κινεῖται δὲ οὐδέν; ἢ τούτῳ πᾶν τοὐναντίον; ἢ τὰ μὲν αὐτῶν κινεῖται, τὰ δὲ μένει;—

Come then,—if ever we ought to invoke God’s aid, now is the time it ought to be done. Let the gods be invoked with all zeal to aid in the demonstration of their own existence. And let us hold fast, so to speak, to a safe cable as we embark on the present discussion. And it is safest, as it seems to me, to adopt the following method of reply when questions such as this are put on these subjects; for instance, when a man asks me—Do all things stand still, Stranger, and nothing move? Or is the exact opposite the truth? Or do some things move