 Finally, according to Kant we must conceive of the highest good as a possible state of affairs in order to fulfill our duty to promote it. Here Kant does not mean that we unavoidably represent the highest good as possible, since his view is that we must represent it as possible only if we are to fulfill our duty of promoting it, and yet we may fail at doing our duty. Rather, we have a choice about whether to conceive of the highest good as possible, to regard it as impossible, or to remain noncommittal (5:144–145). But we can fulfill our duty of promoting the highest good only by choosing to conceive of the highest good as possible, because we cannot promote any end without believing that it is possible to achieve that end (5:122). So fulfilling the sum of all moral duties to promote the highest good requires believing that a world of complete virtue and happiness is not simply “a phantom of the mind” but could actually be realized (5:472).