existence of the virtues without the possession of knowledge in the higher
or philosophical sense is admitted to be possible. Right opinion is again
introduced in the Theaetetus as an account of knowledge, but is rejected on
the ground that it is irrational (as here, because it is not bound by the
tie of the cause), and also because the conception of false opinion is
given up as hopeless. The doctrines of Plato are necessarily different at
different times of his life, as new distinctions are realized, or new
stages of thought attained by him. We are not therefore justified, in
order to take away the appearance of inconsistency, in attributing to him
hidden meanings or remote allusions.

There are no external criteria by which we can determine the date of the
Meno. There is no reason to suppose that any of the Dialogues of Plato
were written before the death of Socrates; the Meno, which appears to be
one of the earliest of them, is proved to have been of a later date by the
allusion of Anytus.

We cannot argue that Plato was more likely to have written, as he has done,
of Meno before than after his miserable death; for we have already seen, in
the examples of Charmides and Critias, that the characters in Plato are
very far from resembling the same characters in history. The repulsive
picture which is given of him in the Anabasis of Xenophon, where he also
appears as the friend of Aristippus 'and a fair youth having lovers,' has
no other trait of likeness to the Meno of Plato.

The place of the Meno in the series is doubtfully indicated by internal
evidence. The main character of the Dialogue is Socrates; but to the
'general definitions' of Socrates is added the Platonic doctrine of
reminiscence. The problems of virtue and knowledge have been discussed in
the Lysis, Laches, Charmides, and Protagoras; the puzzle about knowing and