Sufism, the mystical path within Islam, like other inner traditions such as Yoga and Kabbalah, has both an element of philosophical esotericism and a dimension of practice that can more easily be popularized. The two books under review engage Sufism from very different perspectives. Seyyed Hossein Nasr is an Iranian-American emeritus professor of Islamic studies and author of numerous books on Islam and especially Islamic mysticism. He is the recipient of prestigious awards in religious studies and has delivered the Gifford Lectures. Mary Blye Howe is an American Christian who approaches “interspirituality” through encounters with other religious traditions at the level of embodied practice. She also is the author of A Baptist Among the Jews.