Machiavelli writes that reforming an existing order is one of the most dangerous and difficult things a prince can do. Part of the reason is that people are naturally resistant to change and reform. Those who benefited from the old order will resist change very fiercely. By contrast, those who can benefit from the new order will be less fierce in their support, because the new order is unfamiliar and they are not certain it will live up to its promises. Moreover, it is impossible for the prince to satisfy everybody's expectations. Inevitably, he will disappoint some of his followers. Therefore, a prince must have the means to force his supporters to keep supporting him even when they start having second thoughts, otherwise he will lose his power. Only armed prophets, like Moses, succeed in bringing lasting change. Machiavelli claims that Moses killed uncountable numbers of his own people in order to enforce his will.