The question concerning the role of reason in morality has been considered greatly by moral philosophers, including David Hume (1711-1776), Scottish significant philosopher. According to flume reason suffers severe Limitations, and it plays only a preliminary or subordinate part in morality, and the main role is allocated to sentiments and passions. However, he was not steadfast to this viewpoint for all times, but sometimes took views contradicated it. Indeed, he has showed, in practice , that reason is to be taken as having a more fundamental part.