"Thus, Descartes makes a clear distinction, in the Second Reply, between the truth of a mental content to which we immediately attend and that truth recalled by memory when the initial intuition is no longer attended to. He illustrates his point in reference to the cognito: When someone says “I am thinking, therefore I am , or exist,” he does not deduce existence from thought by means of syllogism, but recognizes it as something self-evident by a simple intuition of the mind."