SOCRATES: And if the thing opined be erroneous, might we not say that the opinion, being erroneous, is not right or rightly opined?
PROTARCHUS: Certainly.
SOCRATES: And if we see a pleasure or pain which errs in respect of its object, shall we call that right or good, or by any honourable name?
PROTARCHUS: Not if the pleasure is mistaken; how could we?
SOCRATES: And surely pleasure often appears to accompany an opinion which is not true, but false?
PROTARCHUS: Certainly it does; and in that case, Socrates, as we were saying, the opinion is false, but no one could call the actual pleasure false.
SOCRATES: How eagerly, Protarchus, do you rush to the defence of pleasure!
PROTARCHUS: Nay, Socrates, I only repeat what I hear.
SOCRATES: And is there no difference, my friend, between that pleasure which is associated with right opinion and knowledge, and that which is often found in all of us associated with falsehood and ignorance?
PROTARCHUS: There must be a very great difference, between them.