The Meno begins with Socrates and Meno discussing whether virtue can be taught. Socrates insists that they cannot settle this question without knowing what virtue is (71b, 86d). Knowledge of virtue requires finding the one form over the many virtuous things (72c). With this understanding of their inquiry, Socrates and Meno discuss a number of familiar Socratic themes -- such as the elimination of disputed terms from definitions (75bc, 79de), the relation among the virtues (73de, 79a-d), the good-dependence of desire (77c-78a), and the role of virtue and externals in eudaimonia (78c-e).
MENO'S PARADOX
But then, after a familiar statement of Socratic ignorance, Meno raises
a problem for their inquiry.
How will you look for it [virtue], Socrates, when you do not know at all what it is? How will you aim to search for something you do not know at all? If you should meet with it, how will you know that this is the thing that you did not know [80d]?The paradox is roughly this: how is knowledge or even inquiry possible if
(a) inquiry into F is necessary for knowledge of F, andSocrates accepts (a) (71b). (b) is new and what raises the present problem. But (b) is a natural challenge to Socratic inquiry. If, as Socrates claims, he is ignorant about virtue, how can he hope to identify and assess definitions of virtue?
(b) knowledge of F is necessary for inquiry into F.
We might reconstruct Meno's worry as follows.
KNOWLEDGE AND TRUE BELIEF
Socrates distinguishes between knowledge and true belief
(85c5-6; cf. 97b1-2) and claims that inquiry without knowledge was possible
because the slave had some true beliefs; elenctic examination of beliefs,
some number of which are true, will help identify these and other true
beliefs and provide the sort of justification that can turn these true
beliefs into knowledge (85c5-d3; cf. 97d8-98a4).
Specifically, we can reject Meno's paradox by rejecting (2). Knowledge of x is not necessary to identify x; some true beliefs about x are sufficient to "fix the reference" of `x` and identify x for purposes of inquiring into x's nature.
THE THEORY OF RECOLLECTION
So far, this is a deflationary or nonmetaphysical account of Socrates's
reply to Meno's paradox. It ignores Plato's famous doctrine of Anamnesis
or Recollection. Recollection posits the immorality of the
soul and claims that embodied souls have existed previously (at least some
of the time in other bodies). In their wanderings, these souls have
learned all there is to know; but in the process of embodiment, the soul
forgets this knowledge. The prodding of the elenchus accesses this
information; because the beliefs are brought back without their account
(logos), the person recalls true beliefs. Proper elenctic investigation
restores this account and so restores knowledge (81b3-e3, 85c1-86b3, 97d8-98a8).
THE RELATION BETWEEN RECOLLECTION AND TRUE BELIEF
But what exactly is the relationship between the appeals to Recollection
and True Belief? Plato seems to accept True Belief. Why add
Recollection?
Perhaps Recollection is added as an "inference to the best explanation". Recollection supplements True Belief by offering an explanation of the latter's claims. How do interlocutors come to have the true beliefs that are sufficient for the possibility of inquiry? Is this just some fortunate coincidence? Recollection seems to provide an answer: it's no accident that interlocutors (e.g. the slave) have (has) true beliefs; souls have been around for a long time -- long enough to have acquired knowledge.
Recollection might actually seem to be a bad explanation of True Belief, because it might seem to be incompatible with it. True Belief resolves Meno's paradox by appeal to the interlocutor's possession of true beliefs without knowledge. But Recollection may seem to ascribe knowledge, and not just true belief, to the interlocutor. But this objection misunderstands Recollection. Meno's paradox asks how the interlocutor can inquire without knowledge; True Belief says this is possible if she has true beliefs without knowledge. Recollection posits knowledge -- but not in the interlocutor at the time of inquiry. At the outset of inquiry, Recollection allows, the interlocutor has no knowledge, not even tacit knowledge. According to Recollection, it is the interlocutor's soul that knew p but has forgotten. Embodiment strips the soul of the account of p and, sometimes, p itself. So at the time of inquiry, the interlocutor has at most some (not all) true beliefs, and some of these can only be retrieved by elenctic prodding. So, whereas True Belief appeals to true beliefs without knowledge, Recollection appeals to prior knowledge; these two claims are compatible.
But Recollection does posit prior knowledge (81c6-7). Of course, if we had such knowledge and lost the account (logos), we might see how we now have true belief. But this just pushes our question back. How did we acquire this knowledge previously? We may have had an infinite amount of time to gather knowledge, but the worry Meno's paradox raises is not affected by how long we had to pursue inquiry -- it isn't that inquiry is impossible iff you're in a hurry. If we assume that the appeal to true belief must be explained in terms of prior knowledge, as Recollection does, we seem to be off on an infinite and apparently vicious regress.
Recollection seems insufficient as a resolution of Meno's paradox; it also seems unnecessary. Why not just accept True Belief? Inquiry is possible if we have some beliefs about the subject matter of the inquiry, and successful inquiry is possible if enough of our initial beliefs are true (or sufficiently approximately true). We can ask how we come by true beliefs. This is a perfectly sensible question, but the resolution of the paradox does not depend upon its answer. The question itself initiates a particular inquiry that we can pursue if we have some initial beliefs and that we can pursue successfully if we have some true beliefs.
Consider an evolutionary explanation of why beings like us should hold true beliefs in terms of the selective advantages of (certain) true beliefs. Though someone might try to argue in this way that certain true beliefs could be "hard wired" into us, a more modest suggestion might be that this explains why what is hard wired is not specific true beliefs -- innate beliefs or ideas -- but certain cognitive capacities -- innate capacities -- that when stimulated in certain ways activate cognitive faculties that acquire and process beliefs in reliable ways.
Socrates is concerned with moral inquiry. We may wonder whether there's any comparable explanation of innate moral beliefs or capacities. Here Plato might appeal to the account Protagoras offered in defense of the claim virtue is widely distributed within Athenian society. It's no accident that people should possess reasonably reliable moral capacities; a certain amount of (other-regarding) virtue is necessary to secure and maintain the benefits of social intercourse and stability (Pr 323a, 324d-325a).
Of course, such innateness hypotheses differ from Recollection in important
ways: there are no metaphysical assumptions of immortality, nor is there
the assumption that the interlocutor ever knew or even believed the correct
answer to the inquiry prior to the inquiry. But the innateness hypothesis
nonetheless resembles Recollection at least in this important respect:
it explains the possibility of inquiry and learning by appeal, in part,
to facts about the cognitive equipment that the interlocutor brings to
the inquiry. Nor is it entirely clear that Plato seriously commits
himself to much more than this, for just after explaining True Belief,
Plato has Socrates say that finding knowledge within oneself just is recollection
(85d5-6). Someone might say that the real doctrine of recollection
is just anything, such as True Belief, that explains how learning is possible
in terms of resources within the interlocutor and that the metaphysical
story about prenatal knowledge is merely a metaphor or at most speculation
about what these internal resources are (cf. 86b5-6).