This article raises the need of a historical approach to philosophical texts taking as an example the case of the ethics proposal of David Hume. It shows the interest of Hume that wants to participate actively in the intellectual dialogue of his time and his intention to integrate the scientific method into the moral sciences and how his critique of reason must be understood in this light. To do this, it is quickly mention the intellectual atmosphere of the time and (...) the positions in conflict in the philosophical debate of the 18th century: relativistic skepticism, radical rationalism and naive sentimentality, noting that, deep down, Hume cannot be excluded completely from any of these positions but not typecast in any of them. (shrink)