Así como la existencia del yo ha sido, en el cogito, establecida por una intuición intelectual, también la existencia de Dios queda establecida en el… - René Descartes

Except our own thoughts, there is nothing absolutely in our power.

"In everyday life we must often act without delay, it is a most certain truth that when it is not in our power to discern the truest opinions, we must follow the most probable." (Discourse III, AT VI: 25/CSM I: 123)

[Descartes discusses a traveler lost in a forest to illustrate this. The traveler is lost, and he does not know how to get out of the woods. Descartes’ advice is that the traveler should pick a route, even if it is uncertain, and resolutely stick to it:

"Keep walking as straight as he can in one direction, never changing it for slight reasons even if mere chance made him choose it in the first place; for in this way, even if he does not go exactly where he wishes, he will at least end up in a place where he is likely to be better off than in the middle of a forest." (Ibid.)]

By intuition I mean, not the wavering assurance of the senses, or the deceitful judgment of a misconstructed imagination, but a conception, formed by unclouded mental attention, so easy and distinct as to leave no room for doubt in regard to the thing we are understanding.