Taiji, being born of Wuji, is the mother of yin and yang. In movement, it differentiates; in stillness, it consolidates. It is without excess or insufficiency. Follow, bend, and then extend. When the other is hard, and I am soft, this is called yielding. I go along with the other. This is called adhering. To quick movements, I respond quickly. To slow movements, I follow slowly. Although the transformations have innumerable strands, this principle makes them as one thread. From careful investigation and experience, one may gradually realize how to comprehend energy. From comprehending energy, you will by degrees attain spiritual illumination. Nevertheless, without an exertion of effort over time, one will not be able to have a thorough understanding of it.