Heaven and earth are unkind and regard all things as stupid dogs.
There is a saying in Tao: Man follows the earth, earth follows heaven, heaven follows Tao, and Tao follows nature.
However, the road to spiritual practice is full of thorns. Where is the road to immortality?
All sentient beings strive for eternal life, so why should they obey the heaven and rebel against it?
How can a mortal move towards immortality step by step in this complex world of cultivation?