To be angry with God means to realize at the deepest level, a place that is both physical and emotional at the same time, that the world is broken and not as it should be. Anger at God is protest against suffering. That suffering can be caused by social inequity and structural injustice, but it is also caused by personal losses, physical pain, and the reality of death, our own and that of others—this cruelty built into the human condition. To be angry at God, not in theory or idea, but in the body—the anger that rises up from the solar plexus and out through the arms and legs and mouth—is to pray, for it is to lay bare, in the most intimate way, the wounds of life felt deep in the body itself, to expose them as though open to the sun, to expose the deepest part of the self to God, that unknowable Other who lurks in wheat fields on the sun-baked high plains of Spain.
--Kerry Egan, from Fumbling: A Pilgrimage Tale of Love, Grief, and Spiritual Renewal of the Camino de Santiago