Isn't this phenomen commonly referred to as the
Dunning Kruger Effect? As published in "Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments"
Though, there are prior references.
Confucius: "Real knowledge is to know the extent of one's ignorance."
Bertrand Russell: "One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision."
Charles Darwin: "ignorance more frequently begets confidence than does knowledge."
Shakespeare: "The Foole doth thinke he is wise, but the wiseman knowes himselfe to be a Foole."
Uno