The famous saying comes from: Han Fei in the Eastern Zhou and Warring States Period.
Greed is like fire, if it is not stopped, it will start a prairie fire; Desire is like water. If it is not stopped, it will be monstrous. Everything is wrong, which means greed is like wildfire. If it is not stopped, it will start a prairie fire. Desire is like a river, if it is not contained, it will set off great waves. "Cultivate one's morality for respect", "cultivate one's morality for harmony" and "cultivate one's morality for the people for harmony" come from The Analects of Confucius, which means that a gentleman should improve his self-cultivation, be cautious in words and deeds, appease others and make people happy.