THE SYSTEM OF DESCARTES.--In the works of Descartes there are a general system of philosophy, a psychology, and a method. This order is here adopted because of the three, in Descartes; it is the third which is the most important, and which has left the most profound traces. The foundation of the system of Descartes is belief in God and in the goodness of God. I say the foundation and not the starting-point. The starting-point is another matter; but it will be clearly seen that the foundation is what has just been stated. The starting-point is this: I do not believe, provisionally, in anything, not wishing to take into account what I have been taught. I doubt everything. Is there anything I cannot doubt? It seems to me there is: I cannot doubt that I doubt. Now if I doubt, I think; if I think, I am. There is one certainty, I am. And having arrived there, Descartes is at a dead stop, for from the certitude of one's own existence nothing can be deduced save the certitude of one's existence. For instance, shall I believe in the existence of everything that is not myself? There is no reason why I should believe in it. The world may be a dream. But if I believe in God and in a God of perfect goodness, I can then believe in something outside of myself, for God not being able to deceive Himself or me, if He permits me to see the external world, it is because this external world exists. There are already, therefore, three things in which I believe: my own existence, that of God, and that of the universe. Which of these beliefs is the fundamental one? Evidently, the one not demonstrated; the axiom is that upon which one rests to demonstrate everything except itself. Now of the three things in which Descartes believed, his own existence is demonstrated by the impossibility of thinking or feeling, without feeling his own existence; the other is demonstrated by the existence of a good God; the existence of a good God is demonstrated by nothing. It is believed. Hence belief in a good God is Descartes' foundation. This has not been introduced in order that he may escape from the _I am_ at which he came to a stop; that belief certainly existed previously, and if he had recourse to it, it was because it existed first. Without that, he had too much intellectual honesty to invent it for a particular need. He had it, and he found it as it were in reserve when he asked himself if he could go beyond _I am_. Here was his foundation; all the rest would complete the proof.