In two parts of his work Introduction to Universal History, Ibn Khaldun studies those perceptions of supernatural character which some individuals possess. In respect to these, an essential notion to him is that of “Veil of the senses”. according to him –and to other previous authors of whom he takes this notion– sensitivity, which is usually a basic element in common human perception, is seen as an obstacle to supernatural perceptions, for these are not reached by the usual means of (...) knowledge, but by what he conceives as particular revelations of the angelic world. This paper deals about that notion in the first part of his aforesaid work. (shrink)