Although the reincarnation of spiritual essence and the reincarnation of spirit and soul are not the same thing at all.
Just like when he sent Yu Xian and Lord Yellow Sand's strands of spiritual essence to reincarnate as childhood sweethearts.
The reincarnated versions of themselves could no longer be considered the original person, but through a twist of fate, they might possess some memories of their previous lives.
Yet, with the reincarnation of spirit and soul, no matter how many times one undergoes reincarnation, the person remains the same. Given the right opportunity, they could awaken their innate wisdom.
Why did he understand this so clearly?
Because long ago, he suspected that he was not a case of transmigration, but of reincarnation.
If it were transmigration, his spirit and soul would feel some disharmony and rejection with the original body.
But up until now, he had reached the Dongtian realm, and still, he had not sensed anything in him that felt out of place.