There are yin and yang in Tao, and people distinguish between good and evil.
Yin arises from Yang, and evil exists from good.
Good nature or evil nature are all born from one thought.
A single thought of persistence can lead to a Buddha, a single thought of greed can lead to a devil.
One lotus bears two flowers, and the roots and stems are intertwined.
One soul gives birth to two lives, life and death are never separated.