Metaphor greed can never be satisfied. To make a metaphor, if people's desires are not satisfied, they will make things like snakes swallowing elephants; When people are greedy, they will be harmed by their own desires. As a famous saying, there are different versions circulating in different places, but the purpose of persuading people to be content with contentment is the same as keeping their duty in a sense. The philosophical education it contains has inspired generations of history, and it is still of great significance to correctly guide people's consciousness in today's materialistic society.