The third and fourth parts have written that Socrates and Meno discussed the is virtues as knowledge? If virtue is knowledge, who can teach virtue. Socrates believes that virtue is good for us, but it must be used properly. He gave an example. If a person has a lot of money, it is very beneficial to that person. But if he uses the money to do something bad, then this is not a virtue. Because he did not use money properly.

Socrates：
Then let us see, in particular instances, what sort of things they are that profit us. Health, let us say, and strength, and beauty, and wealth—these and their like we call profitable, do we not?
Meno：
Yes.
Socrates：
But these same things, we admit, actually harm us at times; or do you dispute that statement?
Meno：
No, I agree.
Socrates：
Consider now, what is the guiding condition in each case that makes them at one time profitable, and at another harmful. Are they not profitable when the use of them is right, and harmful when it is not?
Meno：
To be sure.

He also said that if virtue is brave, just, temperate and the like. But if you don’t have the rationality to do brave things, then it is just reckless.

Socrates:
Then let us consider next the goods of the soul: by these you understand temperance, justice, courage, intelligence, memory, magnanimity, and so forth?
Meno:
Yes.
Socrates:
Now tell me; such of these as you think are not knowledge, but different from knowledge— do they not sometimes harm us, and sometimes profit us? For example, courage, if it is courage apart from prudence, and only a sort of boldness : when a man is bold without sense, he is harmed; but when he has sense at the same time, he is profited, is he not?
Meno:
Yes.

Socrates and Anytus later discussed whether virtue can be taught. Socrates believes that if one wants to learn a true virtue and knowledge, he should send that person to someone who is called a “wise man.” But Anytus disagreed with Socrates’s point of view. Anytus believes that those who are called “wise men” are corrupt, selfish, corrupt officials. Anytus also believes that those who give money to the “wise” are stupid to learn the “virtues and knowledge”.

Anytus：
To whom are you referring, Socrates?
Socrates：
Surely you know as well as anyone; they are the men whom people call sophists.
Anytus：
For heaven’s sake hold your tongue, Socrates! May no kinsman or friend of mine, whether of this city or another, be seized with such madness as to let himself be infected with the company of those men; for they are a manifest plague and corruption to those who frequent them.

I think there is some truth in what Anytus said. In this era, there are indeed many people who use the hat of “sage” to deceive people’s money and trust. There are even a lot of powerful officials who use their rights to make money and benefits for themselves. But this is also the reality of society and the nature of mankind.