At first, he thought this Daoist Skill was just like that, so he didn't think much of it. But it wasn't until after he read the "Nine-Numbered Taishi Lingbao Xuanming Scripture", and went through many insights and notes interspersed within, that he understood the reason behind it.
All cultivation techniques and Divine Skills in the world are not something you can practice at will. Whatever cultivation technique matches whatever Divine Passage Skill, otherwise no matter how diligently you cultivate, you cannot achieve Great Success.
Just like Zhuang Bufan, the cultivation method he practices is one of the sect's Three Skills and Five Classics, the "Kunyu Micro Dust Skill."