Aristotle found a problem at the foundations of epistemology: an infinite regress of justification.
Reason and Intuition (Parsons, 1998) - http://logic.harvard.edu/EFI_Parsons_ReasonAndIntuition.pdf
The Stanford Encyclopedia of Philosophy Intuition - https://plato.stanford.edu/entries/intuition/ Aristotle’s Logic - https://plato.stanford.edu/entries/aristotle-logic/ Foundationalist Theories of Epistemic Justification - https://plato.stanford.edu/entries/justep-foundational/ Coherentist Theories of Epistemic Justification - https://plato.stanford.edu/entries/justep-coherence/
“Regress Argument,” on Wikipedia - https://en.wikipedia.org/wiki/Regress_argument