This psychological action and reaction in a requisite manner is the organisation, and, if this action and reaction ceases psychologically, there is, once again, a discrete, isolated phenomenon of individuals existing without any society. If there were no mental reactions in human beings, they would remain as mere substances, isolated individuals, and not form a society or anything of the sort. So, in a philosophical study, the basic substance is investigated into so that it becomes easy to know what reactions it sets up through the characteristics it possesses. From two persons becoming friends and enlarging this friendship into a family group, it can expand into a community of people and, further, into a national spirit or an international organisation, and so on. Yet, the principle is the same.
Human minds act and react.
Therefore, what is called a social set up, whatever be the extent or the dimension of it, is psychological and not physical. No human institution survives for eternity. All empires came and fell. No kingdom succeeded for eternity, and no institution can, because all institutions which are humanly organised are conditioned by the evolutionary factors to which the minds of people are subject, and, as there is an advance in evolution, there is, naturally, a change in the set up of psychic actions and reactions. Therefore, human institutions cannot be perpetually established in the world.