There are demons as well as spirits who, when they are in action, work and speak with a fourfold sound, meaning that there are four beats, like the sound of threshing. Their conversation and the sound [of their action] tramp along to this, so to speak. With some it goes more slowly, with others faster. When it goes still faster, it falls into step with the quickest fourfold or four-footed sounds of those mentioned here and there before [1031, 1036]. By this kind of sound, therefore, one can tell them apart from other demons and spirits.