Where did the phrase "you can purify your heart" first come from?

From Lin Xinju's Zen essay "The Fragrance of the Water in the Stream", "It's ok to have a pure heart", there is a teapot poem - "It's also possible to be pure, it's ok to be pure, it's ok to be pure, it's ok to be pure ."

"The Fragrance of the Stream" is a book published by China Youth Publishing House in January 1994. The author is Lin Xinju. This book mainly contains selected outstanding works of Lin Xinju.

Extended information:

Introduction to the author

Lin Xinju, born in 1952, Douliu, Yunlin, Taiwan, graduated from the Art and Engineering Department of the National Academy of Arts in Taiwan In his early years, he was interested in literature, music, art, and photography. In recent years, he has devoted himself to Buddhism and meditation, and has written a series of "Buddhist literature" that combines Buddhist scriptures, Zen scriptures, and life insights. His works have been scattered in various newspapers and magazines and now serve Buddhist institutions.

Engaged in editing work, he has compiled books such as "A Thousand Fingers of Lotus Petals" (a collection of essays), "A Mermaid's Party" (a collection of fairy tales), and "The World is Full of Books" (a collection of reviews); he has published "Sit and Watch" Books such as "Clouds Rising" (Zen Life 1), "Opening the Window of Wisdom" (a collection of inspirational essays).

Reference: Baidu Encyclopedia-Manxi Water Fragrance