A mode of philosophy grounded in itself. It rejects the idea of an external or transcendent ground, but is not thereby anti-foundationalism. Spinoza is probably the most important philosopher of immanence---in his work, God is treated as immanent rather than transcendent, meaning that God does not sit on high judging humans, rather we are at one with His substance. In the twentieth century the principal philosopher of immanence is Deleuze, Gilles---although he substitutes being for God, his ontology is derived from Spinoza.