QUOTE : For society, the interesting outcome of this situation is that progress seldom occurs through the abrupt expulsion by a group of its old ideas in favor of new ideas, but rather through the rearrangement of the thought of the individuals in these groups with respect to each other and with respect to the entire membership of society. It is precisely this interlapping of groups—the variety, the inconsistency of the average man’s mental, social and psychological commitments which makes possible the gradual change from one state of affairs or from one state of mind to another. Few people are life members of one group and of one group only. The ordinary person is a very temporary member of a great number of groups. This is one of the most powerful forces making for progress in society because it makes for receptivity and open-mindedness.