The present translation, prepared by Fr. Thomas Crean, OP, constitutes the first appearance in English of Fr. Hering's book and also the first appearance in English of most of Humbert's writings on prayer. It should certainly be welcomed not only by those interested in Dominican or medieval spirituality but also by any reader who wishes to know more about how Christians have prayed through the centuries and/or those looking for assistance or inspiration in their own spiritual life.