C291 The Gates of Hell

Bai Yingying picked up the Profound Principle Sutra that had changed back to its original form and asked curiously, "Grandpa, why is this book called the Profound Principle Sutra?" She flipped through the book and found that it was the same as the Wordless Heavenly Book. There was nothing in it. She was naturally very disappointed and naturally did not understand what was going on