Why the Prove-It Game can't be won

It's the regress problem. Here is a discussion by Maverick Christian.

Suppose we define evidentialism as follows:

A belief B is justified just in case there is a justified proposition C, which constitutes sufficient evidence for B.

I used to call this "the prove-it game." You need proof for everything you believe, and then proof of the proof, and then proof of the proof of the proof, and then proof of the proof of the proof of the proof, and then proof of the proof of the proof of the proof of the proof, until you finally get tired and give up.