This proverb expresses a spirit of satisfaction and self-sufficiency It means that demand is limited. As long as basic needs can be met, people can easily feel satisfied.

For example, "wrens nest in the forest, but there is only one branch", which means that birds nest in trees, accounting for only the size of one branch. This sentence warns people to be content, not greedy, not to occupy too many resources, as long as it is enough for individuals or families.

Similarly, "rats drink river water, but they are full" means that moles drink water until they meet their basic survival needs. This sentence also warns people not to be greedy, but to be content.

In the field of economics, this sentence also reminds people to consume rationally, not excessively, not blindly pursuing the accumulation of material wealth, but paying attention to the happiness and spiritual pursuit of individuals or families.

In short, this proverb emphasizes the spirit of contentment and self-sufficiency, and encourages people not to be greedy or excessively pursue the accumulation of material wealth, but to pay attention to the happiness and spiritual pursuit of individuals or families.