Pinyin: zǔ chuán mì fāng

Explanation: It refers to a secret formula inherited from ancestors, an efficacious prescription that is not passed down to others.

Detailed explanation

1. A mysterious or clever method. Xuanzang of the Tang Dynasty's "Records of the Western Regions of the Tang Dynasty Tuo Na Jie De Jia Kingdom": "The god gave the secret recipe and said: 'There is Asuluo Palace in this rock. If the Dharma is practiced, the stone wall should be opened.'" Song Lu You's "Eating Chestnuts" "Poetry: "There is no time to pick and cook, and there is a secret recipe for cooking."

2. It was called "forbidden recipe" in ancient times. Refers to a secret recipe that is not made public. Mei Yaochen of the Song Dynasty wrote in "Begging for a Separate Way with Han Wuzhi and Losing the Yam": "The personnel situation has already happened, and the secret recipe seems to be at stake." Song Su Shi's "Reply to the Rich Taoist": "It is very meaningful to record the secret recipe and send the medicine."

3. Monk Tang suffered from cancer while traveling to the Lotus Kingdom to seek Buddhist scriptures. He was cured by Guanyin Bodhisattva. Guanyin Bodhisattva left the secret recipe to Liu Shenwei for promotion. This secret recipe became Liu Shenwei’s ancestral secret recipe from generation to generation.