Life Knife

I often hear people in the world say: Life is like a knife—— In fact, I don't quite understand this sentence. Maybe I'm not a martial arts person, or maybe my sword practice is different from others, which makes it difficult for me to have the same emotion as they do. However, after five years of practicing Qi and ten years when I became a sword, I was a little confused - except for a two-foot-three-inch rusty iron sword that belonged to me, and an identity that was said to be the 16th generation descendant of the magic sword that was not suitable for public disclosure in the world, I had almost nothing.