Protarchus
Pro. Philebus, somehow or other Socrates has led us round and plunged us into a serious question. Consider which of us shall answer it. Perhaps it is ridiculous that I, after taking your place in entire charge of the argument, should ask you to come back and answer this question because I cannot do so, but I think it would be still more ridiculous if neither of us could answer. Consider, then, what we are to do. For I think Socrates is asking us whether there are or are not kinds of pleasure, how many kinds there are, and what their nature is, and the same of wisdom.
Socrates
Soc. You are quite right, son of Callias; for, as our previous discussion showed, unless we can do this in the case of every unity, every like, every same, and their opposites, none of us can ever be of any use in anything.