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Baruch Spinoza: Substances
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Spinoza's argument is conducted a priori, or without appeal to experience, and its truth or falsity rests on what the concept of substance entails logically. Accordingly, God exists by definition, or negatively one must posit a reason for the nonexistence of such a being and again only God would suffice. For him, reason is identical with cause, and the only legitimate distinctions that one can impute to the reason of the universe is to logically separate that which causes and that which is caused.
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Along with this theory, Spinoza believed that there was no room in the substance universe for the ignorance of ones actions. With these actions Spinoza believed the affect will change the rest of the bodies power to act. It could increase or decrease the power even though God alone is the cause of those actions.
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In 1785, Friedrich Heinrich Jacobi published a condemnation of Spinoza's pantheism, after Lessing was thought to have confessed on his deathbed to being a "Spinozist", which was the equivalent in his time of being called an atheist. Jacobi claimed that Spinoza's doctrine was pure materialism, because all Nature and God are said to be nothing but extended substance. This, for Jacobi, was the result of Enlightenment rationalism and it would finally end in absolute atheism. Moses Mendelssohn disagreed with Jacobi, saying that there is no actual difference between theism and pantheism. The entire issue became a major intellectual and religious concern for European civilization at the time, which Immanuel Kant rejected, as he thought that attempts to conceive of transcendent reality would lead to antinomies in thought.
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In propositions one through fifteen of Part One, Spinoza presents the basic elements of his picture of God. God is the infinite, necessarily existing (that is, uncaused), unique substance of the universe. There is only one substance in the universe; it is God; and everything else that is, is in God.
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Spinoza moves from these definitions to demonstrate a series of propositions concerning substance in general and God in particular on the basis of which he will demonstrate that God is the one and only substance. The following two propositions are landmarks in the overall argument and are explicitly invoked in the demonstration of IP14:
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