"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you."
When your trying to understand something or someone or just curious..whether it's a happy, sad, or disturbed abyss...be prepared to take on whatever that is you choose to look into. Everything in life we encounter has some sort of effect on us whether we are aware of those effects or not. You can't be too careless or you may end up tangled up.