Meaning: To fight with the evil dragon, you must understand his methods and weaknesses. Over time, this kind of attention will easily make you lose yourself. And when you look at what you think is evil with a good attitude, those standards are also looking at yourself.

1. After fighting a powerful enemy for a long time, you must have become a person like the opponent because of too much attention and understanding; when you look at evil, evil is like a mirror. Look into your heart. Human nature is complex. There is no pure good or pure evil. In many cases, the two are interchangeable or coexist.

2. "When you stare into the abyss, the abyss stares into you." This sentence comes from section 146 of Nietzsche's "Beyond Good and Evil". This sentence should be connected with the previous sentence. You can better understand the meaning of this sentence by reading:

Wer mit Ungeheuern kmpft, mag zusehn, dass er nicht dabei zum Ungeheuer wird. Und wenn du lange in einen Abgrund blickst, blickt der Abgrund auch in dich hinein.

If you fight with the dragon for too long, you will become a dragon yourself; if you stare into the abyss for too long, the abyss will stare back. ----Nietzsche

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Friedrich Wilhelm Nietzsche (German: Friedrich Wilhelm Nietzsche, October 15, 1844 - August 25, 1900, Aged 55):

A German, a famous philosopher, linguist, cultural critic, poet, composer, and thinker. He is considered the founder of modern Western philosophy. His works have profound implications for religion, Extensive criticism and discussion were raised in the fields of morality, modern culture, philosophy, and science. His writing style is unique, often using aphorisms and paradoxes. Nietzsche had a great influence on the development of subsequent generations of philosophy, especially existentialism and postmodernism.