The phrase "I know that I know nothing," "The only think I know, is that I know nothing," or "I know one thing; that I know nothing" is a well-known saying that is derived from Plato's account of the Greek philosopher Socrates.
This saying is also connected or conflated with the answer to a question Socrates (according to Xenophon) or Chaerephon (according to Plato) is said to have posed to the Pythia, the oracle of Delphi, in which the Oracle stated something to the effect of "Socrates is the wisest."
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Idioms, Fallacies, and Paradoxes
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