Going straight to extreme consciousness quickly is called epiphany; Progressive enlightenment is called gradual enlightenment. In the fifth century, Nirvana Sutra was the main theme in China, and there was a dispute between enlightenment and gradual enlightenment. Later, Daosheng's theory of "enlightenment into Buddha" was confirmed by the translation of 40 volumes of Nirvana Sutra. In China, there are different schools of Zen according to different doctrines, namely Huineng School in the south (called Nanton) and Shen Xiu School in the north (called Beiton). In Fa Xiang Zong, people who are uncertain about the Bodhisattva must go through the process of listening and feeling before they can return to the Bodhisattva. This is called gradually realizing the Bodhisattva, which is also called returning to the Bodhisattva. A bodhisattva who is qualified as a bodhisattva can immediately enter the bodhisattva level without this process, which is called an epiphany bodhisattva, also known as a straight bodhisattva and a great bodhisattva. [Cheng Weizhi on Volume Nine, Hua Yanjing on Volume One, Cheng Weizhi on Volume One and Volume Nine] P5703