Yet the powers which are thus conferred, though purely ideal, act as though they were real; they determine the conduct of men with the same degree of necessity as physical forces. The Arunta who has been rubbed with his churinga feels himself stronger; he is stronger. If he has eaten the flesh of an animal which, though perfectly healthy, is forbidden to him, he will feel himself sick, and may die of it. Surely the soldier who falls while defending his flag does not believe that he sacrifices himself for a bit of cloth. This is all because social thought, owing to the imperative authority that is in it, has an efficacy that individual thought could never have; by the power which it has over our minds, it can make us see things in whatever light it pleases; it adds to reality or deducts from it according to the circumstances. Thus there is one division of nature where the formula of idealism is applicable almost to the letter: this is the social kingdom. Here more than anywhere else, the idea is the reality. Even in this case, of course, idealism is not true without modification. We can never escape the duality of our nature and free ourselves completely from physical necessities: in order to express our own ideas to ourselves, it is necessary, as has been shown above, that we fix them upon material things which symbolize them. But here the part of matter is reduced to a minimum. The object serving as support for the idea is not much in comparison with the ideal superstructure, beneath which it disappears, and also, it counts for nothing in the superstructure. This is what that pseudo-delirium consists in, which we find at the bottom of so many collective representations: it is only a form of this essential idealism.[716] So it is not properly called a delirium, for the ideas thus objectified are well founded, not in the nature of the material things upon which they settle themselves, but in the nature of society.