First, the extremes must be reversed: the vertex; Reverse: transform to the opposite side. When things get to the extreme, they will change in the opposite direction.
Second, extremes meet.
"Zhi Bo" in "Lu's Spring and Autumn Annals" has twelve words: "Everything must be lacking, the extreme will be reversed, and the profit will be lost." It's just that extremes meet, and everything is repeated, and extremes meet, which is too thorough. Life is like this. Failure is easier than success. From "nothing" to "Thai" and from "Thai" to "nothing", there is a long process in the blink of an eye. The so-called "is it too late": it takes a long way for people to succeed from failure, but success is only one step away from failure.
Third, the philosophical origin of the extreme inversion of things In China's ancient philosophy, this is a very far-sighted concept. This philosophy may originate from the Book of Changes, because there are great changes from five to six in the Book of Changes. This is a special concept. You should be wary of fortune tellers, any profession will change. In extreme cases, we must pay special attention, and we can avoid unexpected disasters if we are psychologically prepared. Therefore, it is a famous saying of Laozi in the Tao Te Ching, which means that there are blessings in disasters, and there are also disasters in the blessings.
Later generations often use this sentence to warn everyone not to think that they are blessed, but they must be careful of the disasters that follow. Later, there was an idiom-"A blessing in disguise is a blessing in disguise", which was probably a story written by Lao Tzu to warn people that "misfortune is a blessing to lean on, and misfortune is a hiding place".