Full Idea
By intuition I mean the conception of an attentive mind, so distinct and clear that it has no doubt about what it understands, …a conception that is borne of the sole light of reason. Thus everyone can see intuitively that he exists.
Gist of Idea
We all see intuitively that we exist, where intuition is attentive, clear and distinct rational understanding
Source
René Descartes (Rules for the Direction of the Mind [1628], 03)
Book Reference
Descartes,René: 'Rules for the Direction of the Mind' [Newcomb Library 2023], p.11
A Reaction
By 'intuition' he means self-evident certainty, whereas my concept is of a judgement of which I am reasonably confident, but without sufficient grounds for certainty. This is an early assertion of the Cogito, with a clear statement of its grounding.