Here is a list of suggested resources by Fr. Thomas Keating and other authors: Books by Fr. Thomas Keating Books by Other Authors Open Mind, Open Heart The Path Of Centering Prayer - David Frenette Invitation To Love The Cloud Of Unknowing - Unknown The Mystery Of Christ New Seeds of Contemplation - Thomas Merton Intimacy With God True Self, False Self - Fr. Basil Pennington Consenting To God As God Is Centering Prayer And Inner Awakening - Cynthia Bourgeault Manifesting God The Process Of Forgiveness - Fr. William Meninger The Daily Reader For Contemplative Living The Passion and The Cross - Ronald Rolheiser