It's called the Dunning–Kruger effect. Accurate self-evaluation requires a certain amount of skill and knowledge in the thing you're trying to evaluate. That is: you have to know a certain amount about healing to be able to evaluate how good a healer you are.
People who lack that base knowledge have no way to assess their own skills accurately, and usually mistakenly assume they are far more skilled/knowledgeable than they truly are. Thus, they honestly believe they're really good healers and that they know what they're talking about. This applies across everything humans do, and all of us are susceptible to it. It's a skill in itself to have the self-awareness to realize that you don't know anything and that your self-evaluations are wrong (hence philosophical quotes like "The only thing I know, is that I know nothing").
Or the colloquial: "You don't know what you don't know."
(Interestingly, competent people were found in the same studies to underestimate their own abilities. That leads to a situation where they don't understand that things are easy for them because they're highly skilled/knowledgeable, and instead think that those things must be easy for everyone.)



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