The origin, or what elicits a thought is outside of the thought as is its destination, every thought is a small piece of an endless to and fro of venture and rejoinder. They depend on something which they have to guess at, in a sense, and so are always doubtful. Thought is either scepticism or an assertion in the face of scepticism to the degree to which it compares itself to feeling which is immune to doubt. A reduction of being to beingness is its reduction to feeling, to pure presentness into which thought cannot enter. The cogito on the other hand is a device that forces thought into feeling - it is not 'I am' as another thought but as a moment of feeling. This can only be done by way of the 'I'-thought, the one thought that opens to a kind of feeling, a rather special kind of feeling. Intellectual intuition would be the immediacy required to not surrender the light in thought to the darkness of feeling.