What does the 'door in the wall' represent in the book ("The Door in the Wall") by Marguerite De Angeli?

I read some of the book, and I have to write a summary about it. I looked it up, but none of the summaries I've read discuss the representation of 'the door in the wall'. My last day of school is tomorrow, so it's very crucial that my question is answered as soon as possible!

What does the 'door in the wall' represent in the book ("The Door in the Wall") by Marguerite De Angeli?
The Door in the Wall (by Marguerite de Angeli)





Trust, diligence and finally service are the doors through which Robin (the main character) passes, overcoming the seemingly impregnable wall of affliction, disappointment and loneliness. As Robin takes his place in Sir Peter's family, an opportunity to defend his mentor and the king takes shape. Bravely, Robin does what no other could do and becomes the hero of a great victory, and the pride and delight of his mother and father.





The Door in the Wall, the Newbery Award Medal winner in 1950, is an excellent companion piece to studying the Middle Ages. Marguerite de Angeli (1889-1987), a self-taught illustrator and author of over thirty children's books, carefully developed and researched the idea for the story when traveling in England. The novel is filled with historical facts about life in medieval England. A proper title eluded her until her husband reminded her of an incident when she had counselled her son, "When you come to a stone wall, if you look far enough, you will find a door in it."





This is good advice to remember: whenever adversity blocks our way, and walls us off from our dreams, God provides a door through the wall and makes a better way.





(Hope I wasn't too late to help you!)
Reply:What did the door say to the Wall?........nothing doors don't talk..........Ha Ha