Humanity is a peculiar class of life which, in some degree, determines its own destinies; therefore in practical life _words_ and _ideas_ become _facts_—facts, moreover, which bring about important practical consequences. For instance, many millions of human beings have defined a stroke of lightning as being the “punishment of God” of evil men; other millions have defined it as a “natural, casual, periodical phenomenon”; yet other millions have defined it as an “electric spark.” What has been the result of these “non-important” definitions in practical life? In the case of the first definition, when lightning struck a house, the population naturally made no attempt to save the house or anything in it, because to do so would be against the “definition” which proclaims the phenomenon to be a “punishment for evil,” any attempt to prevent or check the destruction would be an impious act; the sinner would be guilty of “resisting the supreme law” and would deserve to be punished by death. Now in the second instance, a stricken building is treated just as any tree overturned by storm; the people save what they can and try to extinguish the fire. In both instances, the behavior of the populace is the same in one respect; if caught in the open by a storm they take refuge under a tree—a means of safety involving maximum danger but the people do not know it. Now in the third instance, in which the population have a scientifically correct definition of lightning, they provide their houses with lightning rods; and if they are caught by a storm in the open they neither run nor hide under a tree; but when the storm is directly over their heads, they put themselves in a position of minimum exposure by lying flat on the ground until the storm has passed.