There is a branch of philosophy concerned specifically with how we justify our beliefs. The chief concern of "epistemic justification" is determining what counts as a good reason for believing something and how we come about those reasons. While there is a smorgasbord of different theories, one of the bigger is known as "coherentism."
Coherentism is a view that settles for circular reasoning. It does so knowingly because the alternatives are just as bad, if not worse.
It is a great theory to call out the inconsistencies of others, but it has been criticized for allowing circular reasoning.
The problem is that coherentism has been criticized on these very internalist grounds. If we can be justified in believing things based on no other authority than my own beliefs, then it allows the possibility of any outlandish beliefs.
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