Everything in this world was contained in the cause-and-effects.
The life and death.
Inside and outside a lonely grave.
Departing after saying "I love you" three thousand times.
Understanding another person's music; collecting the corpses of their friends at the city gate.
To kill their friend's enemy a thousand miles away after hearing their grudge.
To avenge one's friend even though they had to fight against thousands of foes.
All of above were the cause-and-effects.
It was unnecessary to talk about the events of the mortal world rushing past like the torrent of a river; neither was it necessary to concern oneself with three life times, turning and tossing on the bed, and growing thin without a clue and appetite.
There was a flower on the mountain, which enjoyed the sunlight and rainfall for many years alone. It was the cause-and-effect between a person and the flower if the person happened to pass by and see the flower.