It is this combination of kinship and polar opposition which led people of old to regard both lightning in the heights and seismic disturbances in the depths as signs of direct intervention by higher powers in the affairs of men. A trace of this old feeling lingers in the Greek word θειον (theion), divine, which was used to denote both lightning and sulphur. Influenced by the same conception, the Romans regarded as holy a spot where lightning had struck the earth; they even fenced it off to protect it from human contact. Note in this respect also the biblical report of the event on Mount Sinai, mentioned before, telling of an interplay of volcanic and meteorological phenomena as a sign of the direct intervention of the Godhead.