Rabat - There are lessons that should be learned from the Ben Barka case, which should be used for the good of the nation, King Mohammed VI stressed."Nations build their destiny on their history, with its positive as well as its negatives aspects. Indeed, a people without history is a people without identity. It is also a people for whom there can be no future", King Mohammed underlined in a message on the occasion of the celebration of the fiftieth anniversary of the disappearance of Mehdi Ben Barka, which was read out by Abderrahmane Youssoufi.