The devil does not have a sharp mind, he is very stupid. He is a complete mess, you will not find the end-edge and behaves either as smart or as a fool. His wickedness is clumsy work. God arranged it so that we could figure it out. One must be greatly obscured by pride, so as not to see through the devil. With humility, we are able to recognize the devil's nets, because by humility a person is enlightened and alien to God. Humility is what makes the devil crippled. - St. Paisios the Athonite