This sentence comes from "The Taigong took a pot of water and poured it on the ground, so that his wife could collect it. Naiyu said: 'If you say separation and union, it will be difficult to collect the water." It is said that Jiang Taigong did not suffer After being reused, his wife left him, and after he was reused, he rode home. His wife stopped in front of the horse and begged to reconcile what he said. It means that the matter is settled and irreversible.