Original: His contribution to Chinese philosophy included his assigning special significance to the Analects of Confucius , the Mencius , the Great Learning , and the Doctrine of the Mean ( the Four Books ) , his emphasis on the investigation of things ( gewu ) , and the synthesis of all fundamental Confucian concepts .
Simplified: Zhu Xi or Chu Hsi ( , October 18 , 1130 -- April 23 , 1200 ) was a Confucian scholar during the Song Dynasty .