The quote that best illustrates the story's theme is:
“The first man had his three wishes. Yes,” was the reply; “I don’t know what the first two were, but the third was for death. That’s how I got the paw.”
This quote encapsulates the central theme of the story, which revolves around the dangers of tampering with fate and the unforeseen consequences of desires. It emphasizes that while the monkey's paw grants wishes, those wishes can lead to tragic outcomes, highlighting the overall moral that be careful what you wish for, as it may result in harm.