"川が割れ目や隙間にあることを知れ：小さな水路のものは騒々しく流れるが、大きなものは静かに流れる。満ちていないものは騒音を立てる。満ちているものは静かだ。"

Simplified Meaning:

When you think about rivers and streams, the small ones that go through narrow spaces make a lot of noise, while the big rivers flow quietly. This idea can be applied to people too. People who talk a lot and make a big fuss often don't have much substance or wisdom. They might be trying to seem important or fill a space because they lack confidence or knowledge. On the other hand, those who are truly wise or knowledgeable tend to be quieter and more reserved. They don't need to boast or make noise because they are content and confident in what they know. For example, a student who constantly brags about their grades might actually be insecure or trying to impress others, while a truly excellent student is focused and doesn't feel the need to show off. So, it's often better to listen more and talk less, aiming to be knowledgeable and self-assured rather than loud and attention-seeking.