Quisling was interested in science, eastern religions and metaphysics, eventually building up a library that included the works of Spinoza, Kant, Hegel, and Schopenhauer. He kept up with developments in the realm of quantum physics, but did not keep up with more current philosophical ideas. He blended philosophy and science into a new religion he called Universism, or Universalism, which was a unified explanation of everything. His original writings stretched to a claimed two thousand pages. He rejected the basic teachings of orthodox Christianity and established a new theory of life, which he called "Universism," a term borrowed from a textbook which Jan Jakob Maria de Groot had written on Chinese philosophy. De Groot's book argued that Taoism, Confucianism and Buddhism were all part of a world religion that De Groot called Universism. Quisling described how his philosophy "... followed from the universal theory of relativity, of which the specific and general theories of relativity are special instances." Quisling wanted universism to be the official state religion of his new Norway, and he said "the positing of such a system depends on the progress of science."