The Dunning-Kruger effect lends a scientific name and explanation to a problem that many people immediately recognize—that fools are blind to their own foolishness.
https://www.verywellmind.com/an-overview-of-the-dunning-kruger-effect-4160740
In the quote, "I know that I don't know", Socrates is expressing his belief that true wisdom comes from recognizing one's own ignorance.
"Science is the father of knowledge, but opinion breeds ignorance." - Hippocrates
"Real knowledge is to know the extent of one's ignorance" - Confucius
"Ignorance more frequently begets confidence than does knowledge." Charles Darwin
"Reason obeys itself; and ignorance submits to whatever is dictated to it." - Thomas Paine
"Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity." - Martin Luther King, Jr.
"The highest form of ignorance is when you reject something you don't know anything about." - Wayne Dyer
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