Empty vessels make the most sound
空桶响丁当
Well goes the old saying, "Empty vessels make the most sound. "
俗话说得好：“空桶响丁当。”
This simply means that people without any brains talk the most, whereas learned people don't say much.
这就是指没头脑的人话最多，而有学问的人则不多言。
It is the latter that we should model ourselves on.
我们应以后者为榜样。