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Zhang Zai (simplified Chinese: 张载; traditional Chinese: 張載; pinyin: Zhāng Zài; Wade–Giles: Chang Tsai) (1020–1077) was a Chinese philosopher and politician. He is most known for laying out four ontological goals for intellectuals: to build up the manifestations of Heaven and Earth's spirit, to build up good life for the populace, to develop past sages' endangered scholarship, and to open up eternal peace.