"Tell me further," continued Socrates, "is it lawful for men to behave themselves to one another as they please?" "In nowise," answered Euthydemus; "there are also certain laws which they ought to observe among themselves." "And do they," said Socrates, "who live together according to those laws, live as they ought?" "Yes." "And do they who live as they ought live well?" "Certainly they do." "And does he who knows how to live well with men understand well how to govern his affairs?" "It is likely that he may." "Now, do you believe," said Socrates, "that some men obey the laws without knowing what the laws command?" "I do not believe it." "And when a man knows what he ought to do, do you think he believes that he ought not to do it?" "I do not think so." "And do you know any men who do otherwise than they believe they ought to do?" "None at all." "They, then, who know the laws that men ought to observe among themselves, do what those laws command?" "I believe so." "And do they who do what the laws command, do what is just?" "Most surely." "And they who do what is just are just likewise?" "None but they are so." "We may, therefore, well conclude," said Socrates, "that the just are they who know the laws that men ought to observe among themselves?" "I grant it," said Euthydemus. "And as for wisdom," pursued Socrates, "what shall we say it is? Tell me whether are men said to be wise in regard to the things they know, or in regard to those they do not know?" "There can be no doubt," answered Euthydemus, "but that it is in consideration of what they know; for how can a man be wise in things he knows not?" "Then," said Socrates, "men are wise on account of their knowledge?" "It cannot be otherwise." "Is wisdom anything but what renders us wise?" "No." "Wisdom therefore is only knowledge?" "I think so." "And do you believe," said Socrates, "that it is in the power of a man to know everything?" "Not so much as even the hundredth part." "It is, then, impossible," said Socrates, "to find a man who is wise in all things?" "Indeed it is," said Euthydemus. "It follows, then," said Socrates, "that every man is wise in what he knows?" "I believe so." "But can we, by this same way of comparison, judge of the nature of good?" "As how?" said Euthydemus. "Do you think," said Socrates, "that the same thing is profitable to all men?" "By no means." "Do you believe that the same thing may be profitable to one and hurtful to another?" "I think it may." "Then is it not the good that is profitable?" "Yes, certainly." "Therefore, 'what is profitable is a good to him to whom it is profitable.'" "That is true."