SOCRATES: I will explain. If a man knew the way to Larisa, or anywhere
else, and went to the place and led others thither, would he not be a right
and good guide?

MENO: Certainly.

SOCRATES: And a person who had a right opinion about the way, but had
never been and did not know, might be a good guide also, might he not?

MENO: Certainly.

SOCRATES: And while he has true opinion about that which the other knows,
he will be just as good a guide if he thinks the truth, as he who knows the
truth?

MENO: Exactly.

SOCRATES: Then true opinion is as good a guide to correct action as
knowledge; and that was the point which we omitted in our speculation about
the nature of virtue, when we said that knowledge only is the guide of
right action; whereas there is also right opinion.

MENO: True.

SOCRATES: Then right opinion is not less useful than knowledge?

MENO: The difference, Socrates, is only that he who has knowledge will
always be right; but he who has right opinion will sometimes be right, and
sometimes not.