What is the theme or message about scientific advancements

According to myth how does the grandmother spider capture the suns child

"as one of our outstanding historical figures once said, ‘when a great democracy is destroyed, it will not be because of enemies from without but rather because of enemies from within.’" (paragraph 7) how does this quote reveal mccarthy’s point of view and advance the purpose of his speech?

What background knowledge would best support this inference about mario?