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.
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