We encounter the wall when a crisis turns our world upside down. These walls are not simply one-time events that we pass through and get beyond. They are issues we return to as a part of our ongoing relationship with God. We see this in Abraham, waiting at the wall of infertility for twenty-five years before the birth of his first child with his wife, Sarah. Ten to thirteen years later, God led him to another wall — the separation from Ishmael, his eldest son (conceived with Sarah’s maidservant,