A doubt can be doubted only by a doubt belonging to a higher order. Descartes argues that if we doubt this universal doubt which includes its own doubt, then it gets asserted ; so it must be asserted, i.e. it is indubitable. But we can prove exactly the opposite also. For to assert such a doubt is also to doubt it.

In Meditation 1, Descartes doubted the existence of material bodies; so, he was conceiving of bodies not existing. But, in Meditation 2, he found that he could not doubt his own existence. So, in this method of doubt, he was conceiving of his mind as existing, but of bodies as not existing.

Descartes can not doubt that he exist. The main element of this point is that doubt is a kind of thought. >From anna grier: The one thing Descartes cannot doubt is that he. exist, he can think and that he is a true thing, a thinking thing.

According to the French philosopher Descartes, you can doubt everything except your own doubt. He found this conclusion because during his life there was a lot of confusions and divisions between rational exercises and religious practices.

We doubt a claim when we are lacking certainty and reliability regarding those who are making the claim, the sources of the claim, or when the things about which the claim is being made are not sufficiently justified, that is sufficient reasons have not been supplied for the claim.

In the evil demon argument Descartes proposes an entity who is capable of deceiving us to such a degree that we have reason to doubt the totality of what our senses tell us.

“Descartes says his senses can’t be trusted because they often mislead us. He gives the examples of dreaming and the deceitful demon. He says he can doubt what he sees, his memory, and even that he has a body. ” Descartes believes that the cogito was the foundation of all other knowledge (Foundationalism).