The Thoughtful Guide series is for serious spiritual seekers, looking to deepen their knowledge of particular religion. They are very accessible overviews of the history and the benefits that a particular religious practice can bring to the reader, wellresearched and well balanced. The authors eschew fundamentalism and excessive simplifications, mapping out paths that can be followed with the mind as well as the heart.

Sufism is the heart of Islam. Its key is an inner light and awakening, an outer courtesy and service to humanity. It relates to Islam much as the mystical tradition does to Christianity, but far more prominently.