There’s a psychological phenomenon known as the ‘Dunning-Kruger Effect’. This cognitive bias (discovered by social psychologists David Dunning and Justin Kruger at Cornell University in 1999) is a paradox where people with low ability at a task overestimate their ability, while experts tend to underestimate theirs.

That’s not to say this effect comes as a result of overall intelligence or wisdom, but rather to their competence in specific domains.