Dr Peter Tyler is Director of the Pastoral Theology programme at St Mary's University College, Twickenham, London. His previous writings include John of the Cross: Outstanding Christian Thinker (Continuum 2010), Sources of Transformation — Revitilizing Christian Spirituality (Continuum 2010, edited with Dr Edward Howells) and The Way of Ecstasy — Praying with St Teresa of Avila (Canterbury-SCM 1997).