3. Two defects or inner contradictions have manifested themselves in the philosophy of Descartes. He had considered mind and matter as substances, each one of which excluded the other from itself, and had sought a mediation of the two. But with such conditions no mediation other than an external one is possible. If thought and existence are each one substance, then can they only negate and exclude each other. Unnatural theories, like those which have been mentioned, are the inevitable result of this. The simplest way out of the difficulty is to give up the principle first assumed, to strip off their independence from the two opposites, and instead of regarding them as substances, view them as accidents of one substance. This way of escape is moreover indicated by a particular circumstance. According to Descartes, God is the infinite substance, the peculiar substance in the proper sense of the word. Mind and matter are indeed substances, but only in relation to each other; in relation to God they are dependent, and not substances. This is, strictly taken, a contradiction. The true consequence were rather to say that neither the Ego (_i. e._ the individual thinking) nor the material things are independent, but that this can be predicated only of the one substance, God; this substance alone has a real being, and all the being which belongs to individual essences these latter possess not as a substantial being, but only as accidents of the one only true and real substance. Malebranche approached this consequence. With him the bodily world is ideally at least resolved and made to sink in God, in whom are the eternal archetypes of all things. But _Spinoza_ has most decidedly and logically adopted this consequence, and affirmed the accidence of all individual being and the exclusive substantiality of God alone. His system is the perfection and the truth of the Cartesian. SECTION XXVI. SPINOZA.