Every influence, every motive, that provokes the spirit of murder among men, impels these mountaineers to deeds of treachery and violence. The strong aboriginal propensity to kill, inherent in all human beings, has in these valleys been preserved in unexampled strength and vigour. That religion, which above all others was founded and propagated by the sword — the tenets and principles of which are instinct with incentives to slaughter and which in three continents has produced fighting breeds of men — stimulates a wild and merciless fanaticism. The love of plunder, always a characteristic of hill tribes, is fostered by the spectacle of opulence and luxury which, to their eyes, the cities and plains of the south display. A code of honour not less punctilious than that of old Spain, is supported by vendettas as implacable as those of Corsica.