The meaning of this sentence is:

The best good is like water: the most correct good deeds should be like water (live in humility like water, have intentions as deep as water, make friends He must be as intimate as water, his speech must be as sincere as water, his government must be as orderly as water, his work must be as omnipotent as water, and his behavior must be as ready as water, just because he is like water and has no competition with all things. . )

Be virtuous and carry everything: A person with high moral standards should be able to carry all things, which means being kind and not rebellious.

Three thousand weak waters, only one will be chosen: The ancients often used weak waters to refer to dangerous and distant rivers. In this sentence it refers to rivers. Zhen, ladle, container for holding water. The meaning of the whole sentence is that although the river is three thousand miles long, I only take one scoop to drink. It means that no matter how many things I have, I only need that one thing and I won’t be greedy for more. This sentence was later basically extended to the exclusiveness of love.