In his book warning in a time of prosperity, Zheng guanying expresses his intense attention to ＂ weak groups＂ including the imprisoned and traded slaves from a humanistic view and raises some strategies in helping them in terms of instructive training and the establishing of salvation institutions and even consensus supervision. These strategies serve his ultimate aim of ＂getting rich and saving the nation＂, which can be used by us for reference in our current mission of help...
