During his life, Bl. Columba Marmion was searched for by anyone who had concerns about spirituality, meditation, or sin; and his extraordinary talents of spiritual guidance are on show in this unique collection of letters sent between him and different believers. Union with God displays a man speaking not just from his experience, but also from the depths of his soul. Marmion uses his immense theological expertise in these letters to provide guidance that is both practical and deep, simple and exceptional. The astute reader will immediately see why even popes and bishops sought his inspiration and wisdom. Union with God, edited and organised by Dom Raymond Thibaut, joins such classics as Christ the Life of the Soul, Our Way and Our Life, and With Christ.