It first came from Mencius Hui Liang. There were only four disadvantages at that time: widowhood, widowhood, loneliness, independence and no disability. In order to increase its mystery, I added the fact that life can't take care of itself; Because everyone believes that everything has a cause and effect; Then these masters, forcibly changing these causes and effects, will certainly do some bad things and even be condemned by some gods; This is the origin of five disadvantages and three shortcomings.