With the personifications of his destiny to guide and aid him, the hero goes forward in his adventure until he comes to the "threshold guardian" at the entrance to the zone of magnified power. Such custodians bound the world in the four directions—also up and down—standing for the limits of the hero's present sphere, or life horizon. Beyond them is darkness, the unknown, and danger; just as beyond the parental watch is danger to the infant and beyond the protection of his society danger to the member of the tribe. The usual person is more than content, he is even proud, to remain within the indicated bounds, and popular belief gives him every reason to fear so much as the first step into the unexplored.