When he was nineteen, his mother passed away, and he requested Venerable Master Chang Zhi of Sanyuan (Three Conditions) Monastery to shave his head. He was given the Dharma name An Tse and style name To Lun. Dressed in the left-home robes, he built a simple hut by his mother's grave and observed the practice of filial piety. During that period, he made eighteen great vows, bowed to the Avatamsaka (Flower Adornment) Sutra, performed worship and pure repentance, practiced Chan meditation, studied the teachings, ate only one meal a day, and did not lie down to sleep at night. As his skill grew ever more pure, he won the admiration and respect of the villagers. His intensely sincere efforts to purify and cultivate himself moved the Buddhas and Bodhisattvas as well as the Dharma-protecting gods and dragons. The miraculous responses were too many to be counted. As news of these supernatural events spread far and wide, the Master came to be regarded as an extraordinary monk.
One day as he was sitting in meditation, he saw the Great Master, the Sixth Patriarch, come to his hut and tell him, "In the future you will go to the West, where you will meet limitless and boundless numbers of people. The living beings you teach and transform will be as countless as the sands of the Ganges River. That will mark the beginning of the Buddhadharma in the West." After the Sixth Patriarch finished speaking, he suddenly vanished. When his observance of filial piety was completed, the Master went to Changbai Mountain and dwelled in seclusion in the Amitabha Cave, where he practiced austerities. Later he returned to Sanyuan Monastery, where he was chosen to be the head of the assembly. During the period that he lived in Manchuria, the Master contemplated people's potentials and bestowed appropriate teachings. He awakened those who were confused and saved many people's lives. Countless dragons, snakes, foxes, ghosts, and spirits requested to take refuge and receive the precepts from him, changing their evil and cultivating goodness.