The memories from Demon Shore were vast, and the greatest help to Gu An was in her understanding of Reincarnation Tribulation.
Reincarnation Tribulation indeed allows one to be reborn into different times and spaces, even into the past, but whether it's the past or the future, the main body's power cannot intervene. When the reincarnated being dies or exerts the power of the main body, it will be forcibly expelled back by the Heavenly Dao.
This reminded Gu An of the time when Ji Xiaoyu in the Seven Stars Spirit Realm had used the power of a Primordial Daoist Talisman and then quickly disappeared – it seemed she was expelled by the Reincarnation Tribulation.
This deepened Gu An's understanding of the Heavenly Dao.
Heavenly Dao more closely resembles a collection of rules and the Grand Dao, meticulous and domineering.