Channides, the young boy after whom the dialogue was named, was the cousin and ward of Critias, the infamous leader of the Thirty Tyrants. On being introduced to him Socrates starts the discussion "What is self-control?" The lad makes three attempts to answer; seeing his confusion, Critias steps in, "angry with the boy, like a poet angry with an actor who has murdered his poems". But he is not more successful; his three definitions are proved wanting.
"Like men who, seeing others yawn, themselves yawn, he too was in
perplexity. But because he had a great reputation, he was put to
shame before the audience and refused to admit his inability to
define the word."
The dialogue gives no definite answer to the discussion. It is a vivid piece of writing; the contrast between the young lad and the elder cousin whose pet phrases he copies is very striking.
In the Lysis the characters and the conclusion are similar. Lysis is a young lad admired by Hippothales. The first portion of the dialogue consists of a conversation between Lysis and Socrates; the latter recommends the admirer to avoid foolish converse. On the entry of Lysis' friend Menexenus, Socrates starts the question "What is friendship?" It appears that friendship cannot exist between two good or two evil persons, but only between a good man and one who is neither good nor bad, exactly as the philosopher is neither wise nor ignorant, yet he loves knowledge. Still this is not satisfactory; up conclusion being reached, Socrates winds up with a characteristic remark; they think they are friends, yet cannot say what friendship is. This dialogue was carefully read by Aristotle before he gave his famous description in the Ethics: "A friend is a second self". Perhaps Socrates avoided a definite answer because he did not wish to be too serious with these sunny children.
The Euthydemus is an amusing study of the danger which follows upon the use of keen instruments by the unscrupulous. Euthydemus and his brother Dionysodorus are two sophists by trade to whom words mean nothing at all; truth and falsehood are identical, contradiction being an impossibility. As language is meaningless, Socrates himself is quickly reduced to impotence, recovering with difficulty. Plato was no doubt satirising the misuse of the new philosophy which was becoming so popular with young men. When nothing means anything, laughter is the only human language left. The Cratylus is a similarly conceived diversion. Most of it is occupied with fanciful derivations and linguistic discussions of all kinds. It is difficult to say how far Plato is serious. Perhaps the feats of Euthydemus in stripping words of all meaning urged him to some constructive work—for Plato's system is essentially destructive first, then constructive. At any rate, he does insist on the necessity for determining a word's meaning by its derivation, and points out that a language is the possession of a whole people.
In the Protagoras Socrates while a young man is represented as meeting a friend Hippocrates, who was on his way to Protagoras, a sophist from Abdera who had just arrived at Athens. Socrates shows first that his friend has no idea of the seriousness of his action in applying for instruction to a sophist whose definition he is unable to give.
"If your body had been in a critical condition you would have
asked the advice of your friends and deliberated many days before
choosing your doctor. But about your mind, on which depends your
weal or woe according as it is evil or good, you never asked the
advice of father or friend whether you ought to apply to this
newly-arrived stranger. Hearing last night that he was here, you
go to him to-day, ready to spend your own and your friends' money,
convinced that you ought to become a disciple of a man you neither
know nor have talked with."
They proceed to the house of Callias, where they find Protagoras surrounded by strangers from every city who listened spell-bound to his voice.
Protagoras readily promises that Hippocrates would be taught his system which offers "good counsel about his private affairs and power to transact and discuss political matters". Socrates' belief that politics cannot be taught provokes one of the long speeches to which Plato strongly objected because a fundamental fallacy could not be refuted at the outset, vitiating the whole of the subsequent argument. Protagoras recounted a myth, proving that shame and justice were given to every man; these are the basis of politics. Further, cities punish criminals, implying that men can learn politics, while virtue is taught by parents and tutors and the State. Socrates asks whether virtue is one or many. Protagoras replies that there are five main virtues, knowledge, justice, courage, temperance and piety, all distinct. A long rambling speech causes Socrates to protest; his method is the short one of question and answer. By using some very questionable reasoning he proves that all these five virtues are identical. Accordingly, if virtue is one it can be taught, not however, by a sophist or the State, but by a philosopher, for virtue is knowledge.
This conclusion is thoroughly in harmony with Socrates' system. Yet it is probably false. Virtue is not mere knowledge, nor vice ignorance. If they were, they would be intellectual qualities. They are rather moral attributes; experience soon proves that many enlightened persons are vicious and many ignorant people virtuous. The value of this dialogue is its insistence upon the unity of virtue. A good man is not a bundle of separate excellences; he is a whole. Possessing one virtue he potentially has them all.