It could mean that he wants to prevent his son from seeing the monkey's paw.
The conflict is the character is not happy and feels like not many people are happy and can stay happy where they are. The character is sad about the conflict.
Answer:
I believe it means that once you rech your fullest potential, you can make the imposible, posible.
It could also mean that who you are now, you used to think was impossible.
Explanation:
Theses are the two posible meaning I came up with by looking at it two different ways.