The Dark Night of the Soul A Psychiatrist Explores the Connection Between Darkness and Spiritual Growth. Gerald G. May, MD, one of the great spiritual teachers and writers of our time, argues that the dark ‘shadow’ side of the true spiritual life has been trivialised and neglected to our serious detriment. Superficial and naively upbeat spirituality does not heal and enrich the soul. Nor does the other tendency to relegate deep spiritual growth to only mystics and saints. Only the honest, sometimes difficult encounters with what Christian spirituality has called and described in helpful detail as ‘the dark night of the soul’ can lead to true spiritual wholeness.