While Yang Dao and Dao Yin were sitting with each other going through changes in their bodies, completing the set of great dao sutra, they both understood the significance of balance and things that disrupt the balance.
If there was Dao, then there must be the void as well, otherwise, both the things will lose their significance. It was an endless struggle to maintain the balance between these two things. If even one was to get out of control, then the other will destroy the world.
Yes, the great dao that created everything will eventually destroy everything as well. If it was not controlled. The void was their to control the great dao.
The two young people opened their eyes and despite stepping up to the realm of true immortal they had no joy in their eyes. Instead, their faces were solemn. They were the Dao Child Of Heaven and Dao Child Of Hell. They could tell that what they had just learned was not a lie or a figment of their imagination.