Not so the wicked!
They are like the chaff
that the wind blows away.
Here we can see the flip side of the coin.
On one side there is this strong firm tree, planted by a river, bringing forth fruit. It is beautiful, it is beneficial. On the other extreme there is chaff, blowing away in the wind. Chaff is good for nothing. It is purposefully beaten out so that it will blow away.
Once, in the New Testament, Jesus gave a similar illustration of a house built on a firm rock and of a house built on the sand.
Interesting point to ponder: Notice that when Jesus was talking about the wise and the foolish man, he said that the wise man was the one who would "... hear these words of mine and put them into practice."