The Dunning-Kruger Effect

                                                                                                                                                              
                                                                                                                                                              
                                                                                                                                                              


"...the Dunning–Kruger effect is a cognitive bias wherein people of low ability have illusory superiority, mistakenly assessing their cognitive ability as greater than it is. The cognitive bias of illusory superiority derives from the metacognitive inability of low-ability persons to recognize their own ineptitude; without the self-awareness of metacognition, low-ability people cannot objectively evaluate their actual competence or incompetence.

Conversely, highly competent individuals may erroneously assume that tasks easy for them to perform are also easy for other people to perform, or that other people will have a similar understanding of subjects that they themselves are well-versed in.

As described by social psychologists David Dunning and Justin Kruger in 1999, the cognitive bias of illusory superiority results from an internal illusion in people of low ability and from an external misperception in people of high ability; that is, 'the miscalibration of the incompetent stems from an error about the self, whereas the miscalibration of the highly competent stems from an error about others.'..."

--  https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect  (my emphasis)


There are spiritual dimensions here as well, I think.  It says something about a person's spirit whether they are quicker to ascribe (albeit mistakenly) "high competence" to themselves, or to others.