This article studies the interaction between the doctrine of sanctification of the Chinese fundamentalist theologian Jia Yuming (1880-1964) and the Confucian nurturing doctrine of xin (heartmind). This article points out that Jia’s theology of "life" constructs a Chinese Christian teaching of self-cultivation of heart-mind. And its objective is to encourage people to become "Christ-man," whose life is Christ. Jia Yuming asserted that Christianity and Confucianism could learn from each other, though it is a surprising move against the common impression of Fundamentalist theology. He used Confucian terms such as "selfishness" (si xin), "blinded by materialism" (wuyu suo bi), and "addicted" (xian ni) to discuss Christian doctrine of sin. He interpreted the process of Christian sanctification alongside the Confucian teachings in Mengzi (The Book of Mencius) and Daxue (Great Learning). And he asserted that it is similar to the Confucian teaching: "internal sincerity will express itself outwardly." It is not a passive imputation by God, but something that a person can selfcultivate to achieve.