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True, said Protagoras.

Suppose again, I said, that the world says to me: ‘Why do you spend many words and speak in many ways on this subject?’ Excuse me, friends, I should reply; but in the first place there is a difficulty in explaining the meaning of the expression ‘overcome by pleasure’; and the whole argument turns upon this. And even now, if you see any possible way in which evil can be explained as other than pain, or good as other than pleasure, you may still retract. Are you satisfied, then, at having a life of pleasure which is without pain? If you are, and if you are unable to show any good or evil which does not end in pleasure and pain, hear the consequences:—If what you say is true, then the argument is absurd which affirms that a man often does evil knowingly, when he might abstain, because he is seduced and overpowered by pleasure; or again, when you say that a man knowingly refuses to do what is good because he is overcome at the moment by pleasure. And that this is ridiculous will be evident if only we give up the use of various names, such as pleasant and painful, and good and evil. As there are two things, let us call them by two names— first, good and evil, and then pleasant and painful. Assuming this, let us go on to say that a man does evil knowing that he does evil. But some one will ask, Why? Because he is overcome, is the first answer. And by what is he overcome? the enquirer will proceed to ask. And we shall not be able to reply ‘By pleasure,’ for the name of pleasure has been exchanged for that of good. In our answer, then, we shall only say that he is overcome. ‘By what?’ he will reiterate. By the good, we shall have to reply; indeed we shall. Nay, but our questioner will rejoin with a laugh, if he be one of the swaggering sort, ‘That is too ridiculous, that a man should do what he knows to be evil when he ought not, because he is overcome by good. Is that, he will ask, because the good was worthy or not worthy of conquering the evil’? And in answer to that we shall clearly reply, Because it was not worthy; for if it had been worthy, then he who, as we say, was overcome by pleasure, would not have been wrong. ‘But how,’ he will reply, ‘can the good be unworthy of the evil, or the evil of the good’? Is not the real explanation that they are out of proportion to one another, either as greater and smaller, or more and fewer? This we cannot deny. And when you speak of being overcome—‘what do you mean,’ he will say, ‘but that you choose the greater evil in exchange for the lesser good?’ Admitted. And now substitute the names of pleasure and pain for good and evil, and say, not as before, that a man does what is evil knowingly, but that he does what is painful knowingly, and because he is overcome by pleasure, which is unworthy to overcome. What measure is there of the relations of pleasure to pain other than excess and defect, which means that they become greater and smaller, and more and fewer, and differ in degree? For if any one says: ‘Yes, Socrates, but immediate pleasure differs widely from future pleasure and pain’—To that I should reply: And do they differ in anything but in pleasure and pain? There can be no other measure of them. And do you, like a skilful weigher, put into the balance the pleasures and the pains, and their nearness and distance, and weigh them, and then say which outweighs the other. If you weigh pleasures against pleasures, you of course take the more and greater; or if you weigh pains against pains, you take the fewer and the less; or if pleasures against pains, then you choose that course of action in which the painful is exceeded by the pleasant, whether the distant by the near or the near by the distant; and you avoid that course of action in which the pleasant is exceeded by the painful. Would you not admit, my friends, that this is true? I am confident that they cannot deny this.