Books
I will be as broad as the earth. I will not be limited.
— Ray Stannard Baker · Adventures in Contentment

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker uses the earth's breadth to describe the scope they want for themselves. The comparison gives their declaration a sense of enormous possibility. The two sentences reinforce each other, pairing a vast image with a firm refusal to accept a smaller scope.
Context reviewed