In his thinking this world is highly suspect because we cannot be sure that what we perceive is actually true. To a Rationalist this is an appealing approach to truth. But problems develop when we begin to talk about things, especially about the actual existence of things. We know that our system of philosophy works if our original propositions are true. This must be true.
Pure substance is the origin of all else.
Having started his logic out this way, he cannot formulate a God who is anything else but pure substance. He would have no part of such a theology. In this state we are participating in the essence, very substance of God. Human Ethics as a Matter of Natural, Personal Imperatives To Spinoza, good and bad are determined not by some sort of transcendent ideals, some code of law that we all must aspire to, but out of the very logic of our personal being, a quality which will differ somewhat from person to person. This moral logic is a matter of the integrity of our thoughts and our actions.