Because that he had been often bound with fetters and chains, etc. - Luke says (Luk 8:29) that “oftentimes it [the unclean spirit] had caught him”; and after mentioning how they had vainly tried to bind him with chains and fetters, because, “he brake the bands,” he adds, “and was driven of the devil [demon] into the wilderness.” The dark tyrant-power by which he was held clothed him with superhuman strength and made him scorn restraint. Matthew (Mat 8:28) says he was “exceeding fierce, so that no man might pass by that way.” He was the terror of the whole locality.