It means that both the earth and the sky are supported by righteousness. Dimension: Ancient people believed that the earth was square, with four pillars supporting the four corners. Tianzhu: According to ancient legend, there is a copper pillar in Kunlun Mountain, which reaches into the sky and is called Tianzhu. It is also said that there are mountains in the sky as pillars. The earth relies on righteousness to stand, and the sky relies on righteousness to become supreme. It's a pity that I am living in troubled times and have no ability to save people from danger.