According to German philosopher Karl Jaspers, when Spinoza wrote "Deus sive Natura" (God or Nature) Spinoza did not mean to say that God and Nature are interchangeable terms, but rather that God's transcendence was attested by his infinitely many attributes, and that two attributes known by humans, namely Thought and Extension, signified God's immanence. Furthermore, Martial Guéroult suggested the term "panentheism", rather than "pantheism" to describe Spinoza's view of the relation between God and the world. The world is not God, but it is, in a strong sense, "in" God. Yet, American philosopher and self-described panentheist Charles Hartshorne referred to Spinoza's philosophy as "classical pantheism" and distinguished Spinoza's philosophy from panentheism.