Epictetus · The Handbook
Chapter 52
The first and most necessary field in philosophy is the use of the principles – for example, “Do not lie.” The second is the proofs – for example, “Why should one not lie?” The third confirms and articulates the first two – for example, “Why is this a proof?” For what is a proof, what is entailment, what is contradiction, what is true, what is false?
ὁ πρῶτος καὶ ἀναγκαιότατος τόπος ἐστὶν ἐν φιλοσοφίᾳ ὁ τῆς χρήσεως τῶν θεωρημάτων, οἷον τὸ μὴ ψεύδεσθαι· ὁ δεύτερος ὁ τῶν ἀποδείξεων, οἷον πόθεν ὅτι οὐ δεῖ ψεύδεσθαι· τρίτος ὁ αὐτῶν τούτων βεβαιωτικὸς καὶ διαρθρωτικός, οἷον πόθεν ὅτι τοῦτο ἀπόδειξις; τί γάρ ἐστιν ἀπόδειξις, τί ἀκολουθία, τί μάχη, τί ἀληθές, τί ψεῦδος;
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So the third field is necessary for the sake of the second, and the second for the sake of the first. But the most necessary of all – the one where we should come to rest – is the first. We do the reverse: we spend our time in the third field, and all our zeal goes there, while we neglect the first completely. And so we lie – while keeping ready at hand the proof of why one should not lie.
οὐκοῦν ὁ μὲν τρίτος τόπος ἀναγκαῖος διὰ τὸν δεύτερον, ὁ δὲ δεύτερος διὰ τὸν πρῶτον· ὁ δὲ ἀναγκαιότατος καὶ ὅπου ἀναπαύεσθαι δεῖ, ὁ πρῶτος. ἡμεῖς δὲ ἔμπαλιν ποιοῦμεν· ἐν γὰρ τῷ τρίτῳ τόπῳ διατρίβομεν καὶ περὶ ἐκεῖνόν ἐστιν ἡμῖν ἡ πᾶσα σπουδή· τοῦ δὲ πρώτου παντελῶς ἀμελοῦμεν. τοιγαροῦν ψευδόμεθα μέν, πῶς δὲ ἀποδείκνυται ὅτι οὐ δεῖ ψεύδεσθαι, πρόχειρον ἔχομεν.