I do not believe this doctrine (continues Sokrates). Priests, priestesses, and poets (Pindar among them) tell us, that the mind of man is immortal and has existed throughout all past time, in conjunction with successive bodies; alternately abandoning one body, or dying — and taking up new life or reviving in another body. In this perpetual succession of existences, it has seen every thing, — both here and in Hades and everywhere else — and has learnt every thing. But though thus omniscient, it has forgotten the larger portion of its knowledge. Yet what has been thus forgotten may again be revived. What we call learning, is such revival. It is reminiscence of something which the mind had seen in a former state of existence, and knew, but had forgotten. Since then all the parts of nature are analogous, or cognate — and since the mind has gone through and learnt them all — we cannot wonder that the revival of any one part should put it upon the track of recovering for itself all the rest, both about virtue and about every thing else, if a man will only persevere in intent meditation. All research and all learning is thus nothing but reminiscence. In our researches, we are not looking for what we do not know: we are looking for what we do know, but have forgotten. There is therefore ample motive, and ample remuneration, for prosecuting enquiries: and your doctrine which pronounces them to be unprofitable, is incorrect.[16]
[16] Plato, Menon, pp. 81 C-D. Ἇτε οὖν ἡ ψυχὴ ἀθάνατός τε οὖσα καὶ πολλάκις γεγονυῖα, καὶ ἑωρακυῖα καὶ τὰ ἐνθάδε καὶ τὰ ἐν Αἴδου καὶ πάντα χρήματα, οὐκ ἔστιν ὅ τι οὐ μεμάθηκεν· ὥστε οὐδὲν θαυμαστὸν καὶ περὶ ἀρετῆς καὶ περὶ ἄλλων οἷόν τε εἶναι αὐτὴν ἀναμνησθῆναι ἅ γε καὶ πρότερον ἠπίστατο. Ἇτε γὰρ τῆς φύσεως ἁπάσης συγγενοῦς οὔσης καὶ μεμαθηκυίας τῆς ψυχῆς ἅπαντα, οὐδὲν κωλύει ἓν μόνον ἀναμνησθέντα, ὃ δὴ μάθησιν καλοῦσιν ἄνθρωποι, τἄλλα πάντα αὐτὸν ἀνευρεῖν, ἐάν τις ἀνδρεῖος ᾖ καὶ μὴ ἀποκάμνῃ ζητῶν. Τὸ γὰρ ζητεῖν ἄρα καὶ τὸ μανθάνειν ἀνάμνησις ὅλον ἐστίν.
Illustration of this theory — knowledge may be revived by skilful questions in the mind of a man thoroughly untaught. Sokrates questions the slave of Menon.
Sokrates proceeds to illustrate the position, just laid down, by cross-examining Menon’s youthful slave, who, though wholly untaught and having never heard any mention of geometry, is brought by a proper series of questions to give answers out of his own mind, furnishing the solution of a geometrical problem. The first part of the examination brings him to a perception of the difficulty, and makes him feel a painful perplexity, from which he desires to obtain relief:[17] the second part guides his mind in the efforts necessary for fishing up a solution out of its own pre-existing, but forgotten, stores. True opinions, which he had long had within him without knowing it, are awakened by interrogation, and become cognitions. From the fact that the mind thus possesses the truth of things which it has not acquired in this life, Sokrates infers that it must have gone through a pre-existence of indefinite duration, or must be immortal.[18]
[17] Plato, Menon, p. 84 C. Οἴει οὖν ἂν αὐτὸν πρότερον ἐπιχειρῆσαι ζητεῖν ἢ μανθάνειν τοῦτο ὃ ᾦετο εἰδέναι οὐκ εἰδώς, πρὶν εἰς ἀπορίαν κατέπεσεν ἡγησάμενος μὴ εἰδέναι, καὶ ἐπόθησε τὸ εἰδέναι; Οὔ μοι δοκεῖ. Ὤνητο ἄρα ναρκήσας;
[18] Plato, Menon, p. 86. Οὐκοῦν εἰ ἀεὶ ἡ ἀλήθεια ἡμῖν τῶν ὄντων ἐστὶν ἐν τῇ ψυχῇ, ἀθάνατος ἂν ἡ ψυχὴ εἴη;
Enquiry taken up — Whether virtue is teachable? without determining what virtue is.
The former topic of enquiry is now resumed: but at the instance of Menon, the question taken up, is not — “What is virtue?” but — “Is virtue teachable or not?” Sokrates, after renewing his objection against the inversion of philosophical order by discussing the second question without having determined the first, enters upon the discussion hypothetically, assuming as a postulate, that nothing can be taught except knowledge. The question then stands thus — “Is virtue knowledge?“ If it be, it can be taught: if not, it cannot be taught.[19]
[19] Plato, Menon, p. 87.
Virtue is knowledge — no possessions, no attributes, either of mind or body, are good or profitable, except under the guidance of knowledge.