"The whole of Bruno's philosophy is based on his view of an infinite universe with an infinity of worlds. He conceived the universe as a vast interrelationship throughout space and time, comprehending all phenomena, material and spiritual. Thence he was led to contemplate the parts under the mode of relativity. The conception of the infinity of the universe renders meaningless the ascription to it of motion, but Bruno conceives each of the infinitely numerous worlds to be moving on its course in relation to other worlds, impelled by its own twofold nature as individual and as part of the whole. All estimates of direction, position and weight within the whole must be relative. Moreover, the cosmological system is illumined by the properties of number."