The article is about definitions of margins and marginality in Chile during the 18th century and the ways in which the imaginary of evil was related to that definition. From the History of mentalities, this problem is worked through sorcery causes developed in the vast rural world that existed between Santiago and Concepcion in the border area of the Spanish American empire. It is argued that sourcery causes was the expression of a community that felt fragility against the real and imaginary margins built around them, due to instability experienced regarding dominance over these territories and in particular on the subject of their domination: the Indians. There were the expression of the fears of a community that not only feared God and that oftener transgressed its own borders.