All doctrines of sword were composed of initial success, great achievement, completeness, master, and transcendent levels.
Jiang Qingyu's doctrine of sword had achieved master level.
Jiang Chen had tried to comprehend the essence of the Immortal Doctrine of Sword on his own, but what he had was only a part of it.
How to be immortal? What was the essence of immortality? How did one present it?
These questions were perplexing him. He especially couldn't differentiate the Immortal Doctrine of Sword from the Eternal Doctrine of Sword.
Not until then, when Jiang Qingyu threw his sword out. It was like a lamp in the dark, pointing out the way ahead.
Things that never wear out will be immortal.
This was what Jiang Chen had comprehended from Jiang Qingyu's momentum of the sword.