Plato, Laws 799d

ἄλλων τύχοι πορευόμενος, ἀνέροιτʼ ἂν αὑτὸν καὶ τοὺς ἄλλους τὸ ἀπορούμενον, καὶ οὐκ ἂν πρότερον ὁρμήσειεν, πρίν πῃ βεβαιώσαιτο τὴν σκέψιν τῆς πορείας ὅπῃ ποτὲ φέρει. καὶ δὴ καὶ τὸ παρὸν ἡμῖν ὡσαύτως ποιητέον· ἀτόπου γὰρ τὰ νῦν ἐμπεπτωκότος λόγου περὶ νόμων, ἀνάγκη που σκέψιν πᾶσαν ποιήσασθαι, καὶ μὴ ῥᾳδίως οὕτως περὶ τοσούτων τηλικούτους ὄντας φάναι διισχυριζομένους ἐν τῷ παραχρῆμά τι σαφὲς ἂν εἰπεῖν ἔχειν. ἀληθέστατα λέγεις.

will question them too about the matter in doubt, and refuse to proceed until he has made sure by investigation of the direction of his path. We must now do likewise. In our discourse about laws, the point which has now occurred to us being strange, we are bound to investigate it closely; and in a matter so weighty we, at our age, must not lightly assume or assert that we can make any reliable statement about it on the spur of the moment. That is very true.