In geomantic omen, 1234 wants sand and 6789 wants water. What do you mean?

This is the content of Jin Suoyu's biography of Feng Shui. The golden lock and jade pass are mainly used to break good or bad luck with hoes. The heights are sand, mountains, bumps, tall buildings, refrigerators, air conditioners and so on. Everything that is low is water, river, lake, road and low furniture at home. The so-called one foot high is sand and one foot low is water, which is the truth. But in azimuth, where there is sand, there is sand, and where there is water, there is water. Where there is sand, there is water, and where there is water, it is not good to have sand. So there should be sand and water, that is, 1234 needs sand and 6789 needs water. According to Jiugong, 1 is due north, the second is southwest, the third is due east, and the fourth is southeast. These four directions should be auspicious, and if water appears, it will be fierce. 6 is northwest, 7 is due west, 8 is northeast and 9 is due south. These four directions are auspicious, if there is sand.