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.
As a Great Gatsby lover, I know every inch of this and can tell you they stop at Wilson's garage on the way to New York City.
Highest of most successful point