 Miracles became a point of controversy in the letters that passed between Clarke and Leibniz (W 4.605). One focus of the debate is which would be greater: a world so perfectly crafted that God does not need to intervene to keep it running (Leibniz), or a world so dependent on God that one cannot understand the world without recognizing its continual dependence on the operations of God (Clarke). A second focus of the debate is the proper understanding of a miracle: something that exceeds the natural power of created things (Leibniz), or something that seems different from our human expectation of how things operate (Clarke).