God and Extension

Because of his Parallelism, Spinoza's attribution of Extension to his God entails that it is not a product of extending from Thought.  So, though the attribution is radically heterodox, the concept itself is as static as is Descartes'.  However, that God is dynamically extensive in another respect.  For, since, according to Spinoza, every Idea is efficacious, every modification of God consists in an extending of the given.  Thus, for example, the thesis that the universe is expanding entails that so, too, is God, in his system.  Thus, while for Descartes, God is unextended while Extension is indefinite but unchanging, for Spinoza, God indefinitely extends.