And once again, these are ideas he takes from Taoism. But in Neo-Confucian thought, there's this idea of you shouldn't just detach yourself from physical reality, you should study it. There's an order, there's a logic to the universe that could be understood. And because of the influence of the Neo-Confucians, especially their focus on belief in order and logic of the universe, it's no coincidence that the Sung Dynasty saw some of the major technological advancements, not just of China, but of the world, advancements that really put China at the technological forefront. Remember, Europe at this time is in the Middle Ages. The Middle East is under the Golden Age of Islam, but it's really the Chinese who are pushing the envelope here. Now just get a flavor of some of Zhu Zi's writing.