On the one hand, therefore, whenever he met with any who believed themselves men of parts, and for that reason neglected to be instructed, he proved to them that men of the best natural parts are they who have most need of instruction; and to this purpose he alleged the example of a high-mettled horse, who, having more courage and more strength than others, does us very great service, if he be broke and managed in his youth; but if that be neglected, he grows so vicious and unruly that we know not what to do with him.  Thus also dogs of a good breed, and that by nature are the most strong and mettlesome, are excellent for game, if they are well taught; otherwise they are apt to become high rangers and at no command.  In like manner among men they who are blessed with the greatest advantages of Nature, to whom she has given the most courage and the greatest strength to enable them to succeed in their undertakings, are likewise the most virtuous, and do more good than others, when they meet with a good education; but if they remain without instruction they fall into an excess of ill, and become most pernicious to themselves and others.  Merely for want of knowing their duty they often engage themselves in very wicked designs; and being imperious and violent, it is very difficult to keep them within bounds and to make them change their resolution, which is the reason they do a great deal of mischief.

On the other hand, when he saw any of those men who pique themselves on their estates, and who believe because they are men of high condition that they are above instruction, or have no need of it, because their riches alone are sufficient to gain them the esteem of the world, and to make them succeed in all their undertakings, he endeavoured to convince them of their error, and to show them that they, too, have need of instruction.  He told them that that man is a fool who imagines with himself that he can know the things that are useful from those that are hurtful, without having ever learnt the difference; or who, not discerning between them, fondly thinks that because he has wherewithal to buy whatever he has a mind to, he can therefore do whatever may lend to his advantage; or who, judging himself incapable to do what is useful for himself, thinks, nevertheless, that he is well in the world, and in a safe and happy condition of life.  That it is likewise a folly for a man to persuade himself that, being rich and having no merit, he will pass for a man of parts; or that, not having the reputation of being a man of parts, he shall nevertheless be esteemed.

Chapter II.  Conference between Socrates and Euthydemus, in which he convinces that young man, who had A great opinion of himself, that he knew nothing.

When Socrates, on the other hand, found any who soothe themselves up in the belief that they are well instructed, and who boast of their own sufficiency, he never failed to chastise the vanity of such persons.  Of his conduct in this particular I will relate the following instance—­