E pluribus umum is a Latin phrase that translates to "out of many, one", and the phrase is on The Seal of the United States, and on the back of some coins. The meaning behind it is that out of many states, there emerged one nation.
Mrs. Flowers says that Marguerite must understand that people come from different life circumstances. She must be tolerant of ignorance and understanding of illiteracy. She explains that some of the greatest thinkers and humanitarians in history never opened a book.