Socrates is reported to have stated: "One thing I know is that I know nothing."
Socrates' Paradox
See also
Liar's Paradox, Smarandache ParadoxExplore with Wolfram|Alpha
References
Pickover, C. A. Keys to Infinity. New York: Wiley, p. 134, 1995.Cite this as:
Weisstein, Eric W. "Socrates' Paradox." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SocratesParadox.html