To assert that nothing can be asserted contradicts itself.

Objects to

Aristotelian tradition

The skeptic holds a thesis: "no thesis is certain." But this very thesis, does he hold it as certain?
If he holds it as certain, he contradicts himself: here is at least one certainty. If he does not hold it as certain, then it binds us to nothing, and we may go on affirming.
Moreover, no one lives their skepticism: to act, to speak, to eat, the skeptic trusts at every instant a thousand beliefs he claims to suspend.

Therefore Therefore universal doubt cannot be carried through: something is always already taken to be true.

Deepenings

The Pyrrhonian reply

The consistent skeptic replies that his formula is not one more thesis but a report that "purges itself," like a drug expelled along with the humours it drives out.
The practical objection remains: even self-purged, his suspension does not say how to act, and life decides for him what he refuses to decide in thought.

Possible resolutions of the objection

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Challenges

Problem