He did not know that it was already behind him, somewhere back in that vast obscurity beyond the city,

from F. Scott Fitzgerald – The Great Gatsby (Chapter IX) on Rap Genius

Meaning

Gatsby was so obsessed with his dream that it was impossible to attain. The dream went farther back into darkness and soon became unreachable. Gatsby’s material success was actually a failure in the big picture. His dream was in sight but it became warped and unreachable. He hoped and planned for a future life with Daisy that life was only possible in the past.

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