Prayer of the Heart in Christian & Sufi Mysticism
Llewellyn Vaughan-Lee 

A guide through the stages of mystical prayer that draws on Christian and Sufi sources such as St. Teresa of Avila, Attar, St. John of the Cross, and Rumi, as well as from the author’s own experience. The book explores the inner listening of the heart, and the secret of  “pray without ceasing” in which we discover how prayer becomes alive within the heart. More information and testimonials at the website of The Golden Sufi Center.

The publisher has also produced a short video with excerpts from the chapter "Prayer for the Earth."