Final answer:
The statement is true; Descartes asserted that knowledge requires absolute certainty without any doubt, and any skeptical scenario that cannot be definitively ruled out undermines that certainty.
Step-by-step explanation:
According to Descartes, if we are capable of doubting a belief (no matter how small the degree of doubt), that belief cannot be counted as knowledge. The statement is True. René Descartes posited that for a belief to constitute knowledge, there must be no room for doubt—certainty is a strict measure of justification. If any skepticism or possibility of error (such as the evil demon hypothesis) can be conceived without contradiction, then that belief does not meet the threshold for knowledge according to Descartes. The pursuit of indubitable beliefs led to his famous cogito, "I think, therefore I am," which became foundational for his epistemology.