 However, it was Zhu’s adaptation of the Cheng brother’s ideas on Principle (理, C. li, K. i) that governed its reception in Korea (where Principle in italics is used to distinguish this key Neo-Confucian term from Western interpretations of the word). Principle was considered to be an original ideal governing source of all principles of reality in the world, where everything has its own individual principle that is a part of this greater immaterial and universally organising Principle. Cheng Yi even insisted that Principle is one but its manifestations (or sub-principles) are many, while underscoring that it reached its zenith in humans, especially in the human mind, which was endowed with its “good” human nature (SB-Chan: 544). In Korea, Neo-Confucianism is generally referred to as the School of Principle (理學, K. ihak), or School of the Principle and Human Nature (性理學, K. sŏngnihak), highlighting the interest in metaphysics that was examined by the Korean scholars to a whole new microcosmic level (Keum 1980 [2000]; Kang 2003 [2006]).