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If you know what game this is from, then you probably have a good idea of what this can mean to someone. The short version is that a man blinded by vengeance and fear of his own lack of humanity, just hurt someone very dear to him without knowing it. Hearing their final words but not listening to what they mean. He then monologues to himself that he and those like him are a living symbol of everything wrong with the world. But he's speaking of his reason for vengeance, while blind to the actions he committed in that moment. Only understanding half of what his words meant.
Basically the idea of awareness of one's own actions and how badly they can hurt you and everyone around you is a concept that I like to keep in the back of my mind.