The inside of the bell and drum is also hollow, so the sound is smooth and loud, which makes people pay attention.

Assuming that they are solid, wooden fish and bells and drums are bound to be difficult to ring, and it is difficult to make beautiful timbre again, only to hear low voices.

Empty yourself, that is, be generous. The sky is broad enough to accommodate white clouds, and the earth is thick enough to accommodate the growth of all things ... so is man. Only those who can forgive others' mistakes and ignore details can be admired and convinced by everyone and have the ability to lead everyone.