Bàoyìng is a concept of cosmic and moral reciprocity in the Chinese folk religion. It implies that people dwell in a moral universe, a universe that is kept ordained by mores, good actions, thus moral retribution is in fact a cosmic retribution. It determines fate, as written in the Book of Documents: "on the doer of good, heaven sends down all blessings, and on the doer of evil, he sends down all calamities." (書經•湯誥)