You may believe that destiny is determined by God, but you also believe that destiny is self-determined. If fate cannot be changed, then wouldn't it be boring if all the creatures in the three realms and six realms follow a predetermined trajectory?
Someone once jokingly said that everyone must die, and death is a predetermined destiny, but living is a process, a process with many possibilities... What we do is to live, not to die in the end. The Three Realms and Six Paths cycle back and forth, and the most invisible thing is reincarnation.
The sword sings in the wind, and the sleeves flutter with the clouds. Lonely Kunlun is far away, and the stupid world of mortals is far away.