Where does "water has activity and trees have roots" come from?

I want to have a home, a performance sketch by Zhao Benshan and Huang Xiaojuan.

The meaning of these two sentences: to achieve sustainable development, we must open source and consolidate the foundation, and to grasp the essence, we must trace back to the source.

The complete line is as follows:

Zhao Benshan: Everyone laughed. Hehe, the marriage market is weak when you get older. There's no shame in advertising for marriage on TV, is there? Water is active, trees have roots, and there is a reason to advertise for marriage on TV. If you have no money in your pocket, you are eager for cash. If you don't have a home, it is hot water. If you have been single for so many years, who doesn't expect to get married? Everybody laughs!

Related knowledge:

1, water is active, so its flow is infinite; Wood has no roots, so it is not poor. (Song Huhong)

2, release: Because water has a source, it can't flow; Trees are endless because they have roots.

As the saying goes, "water is active, and trees have roots", everything has a fundamental starting point. These two sentences mean that in order to achieve sustainable development, we must open up sources and consolidate the roots, and we must trace back to the source in order to grasp the essence.