When he had his epiphany, the bronze mirror also underwent subtle changes.
"Three more strands of Holy Energy," Xu Qing observed, quite pleased.
Attaining knowledge through the study of nature is "knowledge," which accords with the Dao of Holy Virtue's teachings. If it's within one's capability to combine "knowledge" and "action," then the Holy Energy should continue to increase.
The greatest benefit of Holy Energy is that it can resolve one's doomed fate, extending his lifespan.
But as of now, Xu Qing still didn't know what his doomed fate actually was.
"The ancient texts say that cultivation goes against the heavens, hence heaven will strike down with deadly calamities like the Heavenly Tribulation or people calamities... in short, all kinds of disasters. My tribulation came after possession, even before I began cultivation..."
This tribulation of lifespan is also a sword hanging over Xu Qing's head, not allowing him any slack.