If korbet is the author:
In this scene Korbet was probably nervous to give his crush Tabby a letter. When Korbet gave his letter to his crush Tabby, She crumpled up his paper (possibly mad at him) and called him a “lugnut”. The author used this scene to show others how he possibly got rejected.
Answer:
"Don't try to accomplish impossible things"
Explanation:
Hope it helps!
Obstacles on life’s journey
Hope this helps
Definition:easily persuaded to believe something; credulous.