The objective of this article is to analyze the demon´s function in the book Falacias del demonio y de los vicios que apartan del Camino Real del Cielo […]written by Fray Felix de Alamín- a Spanish capuchin-, reprinted in Madrid at 1714, like an example of the baroque cultural production in Spain that reached to early 18th century. In this period, the politics and socials conjunctures and the long endurance history flowed into the Spanish empire decadence, generating a change in the perception of this “God’s enemy”. We study continuities and discontinuities in demon´s speech written by the friar, reflected by his own time, interconnecting the “Golden Century” in Spain with the mystical bases and religiosity new ways to the early years in the 18th century.