What Liu Ji wants to tell people is that those who are ignorant and have bad conduct must not be tolerated, or even have high hopes, otherwise they will raise tigers and hurt themselves! In his book, he takes Chun's death at the hands of his protege Li Yuan as an example to illustrate this truth.
Can human nature really not be changed? Modern psychology tells us that human nature includes temperament and personality, in which temperament is inherently stable and is mainly determined by the nature of the innate nervous system, and there is no distinction between good and bad; Personality is acquired, mainly determined by growth environment and education, with strong plasticity, good and bad.
We often say that "character determines fate" refers to the plastic case mentioned in psychology. Therefore, we can change our destiny by changing our personality, and our destiny is in our own hands!
"A leopard cannot change his spots" is what psychology calls the former, that is, "temperament", which is innate, stable and hard to change!