The regress argument (also known as the diallelus (Latin < Greek di allelon "through or by means of one another")) is a problem in epistemology and, in general, a problem in any situation where a statement has to be justified.
According to this argument, any proposition requires a justification. However, any justification itself requires support. This means that any proposition whatsoever can be endlessly (infinitely) questioned, like a child who asks "why?" over and over again.
Read more about Regress Argument: Origin, Structure, Responses, Skepticism
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—Richard M. Hare (b. 1919)