In this shiur, delivered at Tomer Devorah, Rav Burg explains why it was Yitzchak's Teffilah and not Rivka's Teffilah that was answered when she was unable to have children. Only when we live with a sense of abundance in our lives are we capable of imagining the world in new ways. When we are defined by our past we have an impoverished mentality and our imagination is more limited.