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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Theaetetus by Plato: the difference which distinguishes it from other things will know that of
which before he had only an opinion.
THEAETETUS: Yes; that is what we are maintaining.
SOCRATES: Nevertheless, Theaetetus, on a nearer view, I find myself quite
disappointed; the picture, which at a distance was not so bad, has now
become altogether unintelligible.
THEAETETUS: What do you mean?
SOCRATES: I will endeavour to explain: I will suppose myself to have true
opinion of you, and if to this I add your definition, then I have
knowledge, but if not, opinion only.
THEAETETUS: Yes.
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