"A person is born with feelings of envy and hate. If he gives way to them, they will lead him to violence and crime, and any sense of loyalty and good faith will be abandoned"

This quote suggests that people are inherently born with unfavorable emotions such as envy and hate. If we allow these emotions to control us, they can lead us down a destructive path towards violent and criminal behavior. Eventually, this will trigger us to lose our sense of commitment and morality. Xun Zi is highlighting the value of self-control and the requirement to resist catching unfavorable emotions in order to preserve a sense of stability and honor.