It means that you accept that the difference isn’t in what you want, but in what you are willing to suffer for. It’s about the trade-offs you’re willing to endure, the beatings you’re willing to take, and it’s about knowing that in spite of all of that, the fruits of your labor may still not amount to anything.
This is a crucial distinction. Our observation of reality is an approximation confined by the boundaries of language. It’s uncertain and in large part unpredictable. As the late Nobel Laureate Albert Camus noted, we live to reason with an unreasonable world and it often leads to a conflicted life.