Steiner postulates that the world is essentially an indivisible unity, but that our consciousness divides it into the sense-perceptible appearance, on the one hand, and the formal nature accessible to our thinking, on the other. He sees in thinking itself an element that can be strengthened and deepened sufficiently to penetrate all that our senses do not reveal to us. Steiner thus considered what appears to human experience as a division between the spiritual and natural worlds to be a conditioned result of the structure of our consciousness, which separates perception and thinking. These two faculties give us not two worlds, but two complementary views of the same world; neither has primacy and the two together are necessary and sufficient to arrive at a complete understanding of the world. In thinking about perception (the path of natural science) and perceiving the process of thinking (the path of spiritual training), it is possible to discover a hidden inner unity between the two poles of our experience. Truth, for Steiner, is paradoxically both an objective discovery and yet "a free creation of the human spirit, that never would exist at all if we did not generate it ourselves. The task of understanding is not to replicate in conceptual form something that already exists, but rather to create a wholly new realm, that together with the world given to our senses constitutes the fullness of reality."