When in the Empyrean, he comprehended the "Path of Emotion," using emotion to enter the path, connecting all things with emotion. Anything with intent will have emotion, and having emotion means he can control it.
The Source World Heavenly Dao is the same.
Though the Heavenly Dao is emotionless, devoid of any bias, after continuously devouring the intents of countless Palace Masters, it inevitably undergoes some changes even it doesn't realize.
It's as if, encountering the same problem, its tolerance for Yuan Sheng would be greater than for others.
This change comes from daily interactions or potential benefits it could bring, which can also be defined as a form of emotion.
This subtle change allowed the emotionless Heavenly Dao to be manipulated by Yuan Sheng, connected through his Path of Emotion to its back garden, borrowing power countless times without being noticed.
"Connection of Love Destiny!"
