The correct answer to this open question is the following.
Unfortunately, you forgot to mention the name of the story. Without the title of the story, we do not know what you are talking about.
However, trying to help you, we did some deep research and found that the story is "Voltaire’s Micromegas."
If that is the case, then the correct answer is the following.
In my own words, the impact of size in the story is that Micromegas .the main character of the story- is a huge entity; a giant we could say. He came from outer space and arrives on planet earth, not knowing that the earth is inhabited by small people, compared to his height.
Micromegas thinks that if earth links are little people, so their intelligence is minimum. But he later finds that this is not the case. You cannot measure people's intelligence by their size.
That is the important lesson of the story and its impact. No matter how small you are, this has nothing to do with your intelligence and the "size" of your knowledge.
