They will agree, he said.
The nature of that art or science will be a matter of future consideration; but the existence of such a science furnishes a demonstrative answer to the question which you asked of me and Protagoras. At the time when you asked the question, if you remember, both of us were agreeing that there was nothing mightier than knowledge, and that knowledge, in whatever existing, must have the advantage over pleasure and all other things; and then you said that pleasure often got the advantage even over a man who has knowledge; and we refused to allow this, and you rejoined: O Protagoras and Socrates, what is the meaning of being overcome by pleasure if not this?—tell us what you call such a state:—if we had immediately and at the time answered 'Ignorance,' you would have laughed at us. But now, in laughing at us, you will be laughing at yourselves: for you also admitted that men err in their choice of pleasures and pains; that is, in their choice of good and evil, from defect of knowledge; and you admitted further, that they err, not only from defect of knowledge in general, but of that particular knowledge which is called measuring. And you are also aware that the erring act which is done without knowledge is done in ignorance. This, therefore, is the meaning of being overcome by pleasure;—ignorance, and that the greatest. And our friends Protagoras and Prodicus and Hippias declare that they are the physicians of ignorance; but you, who are under the mistaken impression that ignorance is not the cause, and that the art of which I am speaking cannot be taught, neither go yourselves, nor send your children, to the Sophists, who are the teachers of these things—you take care of your money and give them none; and the result is, that you are the worse off both in public and private life:—Let us suppose this to be our answer to the world in general: And now I should like to ask you, Hippias, and you, Prodicus, as well as Protagoras (for the argument is to be yours as well as ours), whether you think that I am speaking the truth or not?
They all thought that what I said was entirely true.
Then you agree, I said, that the pleasant is the good, and the painful evil. And here I would beg my friend Prodicus not to introduce his distinction of names, whether he is disposed to say pleasurable, delightful, joyful. However, by whatever name he prefers to call them, I will ask you, most excellent Prodicus, to answer in my sense of the words.
Prodicus laughed and assented, as did the others.
Then, my friends, what do you say to this? Are not all actions honourable and useful, of which the tendency is to make life painless and pleasant? The honourable work is also useful and good?
This was admitted.
Then, I said, if the pleasant is the good, nobody does anything under the idea or conviction that some other thing would be better and is also attainable, when he might do the better. And this inferiority of a man to himself is merely ignorance, as the superiority of a man to himself is wisdom.
They all assented.
And is not ignorance the having a false opinion and being deceived about important matters?