There were many characters on the book Xue Ying was reading, which each of the words and pictures transforming into many different illusory worlds. Xue Ying stood before the simple bookshelf as he read the book. Every time he flipped through a page, there would information transmitted into his mind. These were the comprehension experiences which the seniors who had walked further down the 'Dao of Mirage' had recorded.
Imparting the Dao was very, very difficult.
Due to the Dao being extremely vague and elusive, it was difficult to illustrate it! Thus, there was a huge difference between taking a powerful existence as a teacher to taking a Paragon or a Ruler as a teacher. The higher the realm, the clearer it would be when the expert illustrated the Dao, allowing the younger generation to gain a clearer understanding.