who said the only thing i know is that i know nothing
I know that I know nothing The phrase "I know that I know nothing", "The only thing I know is that I know nothing", "I know one thing; that I know nothing" or 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. The phrase is not one that Socrates himself is ever recorded as saying.