Try to prove anything from scratch and your argument hits one of three dead ends

Try to justify any claim by giving reasons for it, and those reasons need their own justification, and so on. Philosophers argue this chain can only end three ways: going in circles, stopping at an arbitrary unproven assumption, or regressing forever. Named the Münchhausen trilemma, after the baron who claimed he pulled himself out of a swamp by his own hair, it's a core challenge in the theory of knowledge.

— Hans Albert, Grundlegung einer kritischen Philosophie — 1968