How do the twelve immortals in the eight characters serve as an example?

Twelve longevity is used to judge the rise and fall of the eight characters, and the technical terms in the eight characters are well known. It's under four pillars. The four pillars are endowed with longevity, bathing, wearing a crown, being an official and being rich, which shows that the Lord can display his talents well in life. Decline, illness, death, grave, despair, pregnancy and support are all decline, which shows that the fate of the Lord can not be too sharp in life.