Question: who said i know that i know nothing
Answer: The phrase `` I know that I know nothing '' , `` The only thing I know is that I know nothing '' or `` I know one thing ; that I know nothing '' , `` I know that all I know is that I do not know anything '' , called the Socratic paradox , is a well - known saying that is derived from Plato 's account of the Greek philosopher Socrates .