I am reading The Great Gatsby, and encountered these sentences:
There was so much to read, for one thing, and so much fine health to be pulled down out of the young breath-giving air. I bought a dozen volumes on banking and credit and investment securities, and they stood on my shelf in red and gold like new money from the mint, promising to unfold the shining secrets that only Midas and Morgan and Maecenas knew. And I had the high intention of reading many other books besides. I was rather literary in college—one year I wrote a series of very solemn and obvious editorials for the Yale News—and now I was going to bring back all such things into my life and become again that most limited of all specialists, the "well-rounded man." This isn't just an epigram—life is much more successfully looked at from a single window, after all.
The narrator Nick moved into West Egg, and determined to read many books on banking and securities, as well as literary works, in order to become the "well-rounded man."
In this part, I could not understand especially what "limited" means. Does it indicate that the well-rounded men have limited knowledge compared to other specialists? Or does it indicate that the well-rounded men are so rare compared to other specialists?
And I also could not grasp how the concept that the well-rounded man was limited leads to the epigram that life is more successfully viewed from a single window. I think the well-rounded man has many windows, for he knows about everything albeit shallowly, so I couldn't see the connection here. Or, is the author being ironic here, saying that the well-rounded man is a failure because he has so many windows from which he looks out at life?
In short, I would like to know how the well-rounded men are "limited" and how the concept of being a well-rounded man is connected to looking at life from a single window.
I would very much appreciate your help.