is a cognitive bias in which unskilled individuals suffer from illusory superiority, mistakenly rating their ability much higher than average. This bias is attributed to a metacognitive inability of the unskilled to recognize their mistakes.
I came across an early statement of it:
“The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.”
― Charles Bukowski
One imagines that one could find a recognition of the effect as early as Aristotle, or maybe even Hammurabi.