Spinoza’s object was similar; but he sought to attain it in a different manner: rejecting, on the one hand, the dualism by which Descartes had opposed mind and matter, he regarded each as a different mode of the same primitive substance, and, on the other, the limited idea of the divine Being, he conceived that the mind of man realizes the notion of Him as unlimited. There are three different opinions in reference to our capacity of knowing the infinity of God. Either our knowledge of Him is only negative and relative; we know only what He is not, and our positive notions of His nature are drawn from the analogy of human personality; or, secondly, we have an intuition of His infinity, but so bare of attributes, that while it guarantees the reality of our apprehensions of Him, we are dependent on experience for its development into a conception; or, thirdly, the human mind can apprehend His infinity positively, antecedent to the application of limitations to it.(337) The last of these three views belonged to Spinoza, along with the ancient Eleatics, the Neo-Platonists of the early ages, and the principal schools of modern German philosophy. Accordingly he tried to work out with mathematical rigour in geometrical form a philosophy of existence, conceiving that the mind grasps the idea of God as infinite substance, and understands its development under two modes; viz. extension and thought: the former the objective act of Deity, the latter the subjective.(338) The universe therefore is nothing but the manifestation of God: God is the sum total of it; the unity in its variety; the infinite comprehending its finity. Cause and effect are identical; the _natura naturans_, and _natura naturata_. Causation is change; but it is nothing but substance assuming attributes, and attributes assuming modes. Phenomena are only the bubbles which arise on the bosom of the ocean and disappear, absorbed in its vastness. The universe is bound in one vast chain of fatalism, one grand and perfect whole. Man’s perfection is to know by contemplation the universe in which he has his being.