It means that a bucket of rice raises a benefactor and a stone of rice raises an enemy. It means giving someone a bucket of rice at a critical time is like giving charcoal in the snow, and people will be grateful. Over time, if people pay too much, they will be insatiable, take these payments for granted, and once they stop helping, they will be resentful.
This kind of thing often happens in life. When you help someone kindly, he will thank you for the first time. The second time, his gratitude will fade and he will help him several times more. He simply thinks that this is what you should do for him. Even when there is no such help, he will hold a grudge against you, which is called kindness.
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Idiom allusions:
Once upon a time, there were two neighbors, and they usually had a good relationship. One of the families is richer because they are more capable. The two families had no grudges, but this year, widespread indignation and discontent brought disaster, and the grain harvest in Tanaka was poor. The poor family has no harvest, so they can only lie down and wait for death.
At this time, the rich family bought a lot of food, thinking about everyone's neighbors, and sent a liter of rice to the poor family, which was an emergency. This poor family is very grateful to the rich and thinks it is really a lifesaver! The hardest time has passed, and the poor go to the rich to thank them. While speaking, talking about the seeds that have not landed next year, the rich man generously said, well, I still have a lot of food here, so you can take it again.
The poor man went home grateful with a bucket of rice. After returning home, his brother said, what can this rice do? Apart from eating, there won't be enough seeds in our fields next year. This rich man has gone too far. Since you are so rich, you should send us more food and money. It's really bad.
This word reached the ears of the rich man, who was very angry. He thought, I gave you so much food for nothing, and you not only didn't thank me, but also treated me as an enemy. It was inhuman. So, two families with good relations. From then on, they became enemies and never contacted each other again.
References:
Baidu Encyclopedia-Promote Mien and Fight Miqiu