First of all, we must understand what this story is about. It's about two frogs. One worked hard and the other was depressed, but both died in the end.

What the people behind said is the key, saying that frog A is sad and desperate, and frog B is full, because it has no time to be sad and desperate.

You can broaden your mind from here. This is a symbolic story. Frogs refer to people.

This can have two writing ideas (I only think of these two):

First, people are inherently mortal, either lighter than a feather or heavier than Mount Tai. (and then expand from this sentence to other places. )

Second, a full life is meaningful. (same as above)

You don't need me to help you find an argument, do you?

I wish you a happy writing in the future! !