Every foundation calls for a further foundation, without end.

Objects to

Every claim taken to be certain must be justified by a reason that supports it; otherwise it is posited arbitrarily.
But that reason in turn calls for a justification, and this one for another, indefinitely.
To halt the chain, only three exits, all disappointing: continue to infinity, turn in a circle (the reason leans on what it was meant to prove), or stop by fiat on a claim posited without proof.

Therefore Therefore no belief reaches a truly final foundation: the definitive certainty dogmatism demands stays out of reach.

Deepenings

The Cartesian circle

Descartes was charged with this very circle: he secures evidence by the truthfulness of God, yet he establishes God's existence from ideas he calls evident.
If the foundation presupposes what it founds, the first certainty is no longer first: it borrows its warrant from what it was meant to warrant.

Possible resolutions of the objection

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Challenges

Problem