system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does the quote "He who fights with monsters should be careful lest he thereby become a monster. And if thou gaze long into an abyss, the abyss will also gaze into thee" mean?
gpt
Essentially what it warns against is that in fighting something bad, you should be careful not to take actions that make you as bad as the thing you are fighting. It can be really easy to justify extreme measures to yourself if you are fighting something you believe is evil, but sometimes you need to step back and look at what you are doing.