The Great Wall of China had a beginning and an end. It is an external barrier erected for strategic purposes. The most insurmountable walls are the ones in our heads. Anything that is artificially crafted can and will be overcome by people who are resourceful and determined enough to do it.
The reality of rejection cannot be completely circumvented. It is constructive to envision each "wall" as a friendly challenge to your resourcefulness, determination, and strength. Many people got through the Berlin Wall, it was a challenge and a symbol-a place to begin and not to stop.
Our deepest aspirations can be put to rest without having our achieved peace or satisfaction. It is within each of us to learn about this special soil and blossom to our fullest (13th Edition Writer's Guide to Book Editors, Publishers & Literary Agents, Jeff Herman (2002)).