"Success in the sociologists' aim might lead, in T. S. Eliot's phrase, to "systems so perfect that no one would need to be good." This view forgets that men long ago committed themselves to the endeavor to control their own collective behavior, not only in the ways sanctioned by the churches but in others, by making it to men's interest to do good. And they have increasingly based the endeavor on an understanding of natural laws of human behavior, those of economics, for example. So that the question is not: Shall this kind of control be undertaken? but: Where shall it stop? A sociologist might also argue that his religious critics have more faith in him than in their own doctrine, the doctrine that man is infinitely tough and resourceful and is not easily cheated of his freedom to sin. What God has given no man can take away, certainly no sociologist. More seriously, he might argue that the social sciences are not in train to eliminate morality but to make greater demands of it. A sociology that shows us unsuspected or not hitherto understood ways in which men are bound up with one another invites more refined answers to the question: "Am I my brother's keeper?"

“It is really intolerable that we can say only one thing at a time; for social behavior displays many features at the same time, and so in taking them up one by one we necessarily do outrage to its rich, dark, organic unity.”

“In choosing between alternative actions, a person will choose that one for which, as perceived by him at the time, the value, V, of the result, multiplied by the probability, p, of getting the result, is the greater.”

“Social behavior is an exchange of goods, material goods but also non-material ones, such as the symbols of approval or prestige. Persons that give much to others try to get much from them, and persons that get much from others are under pressure to give much to them. This process of influence tends to work out at equilibrium to a balance in the exchanges”

“To consider social behavior as an exchange of goods may clarify the relations among four bodies of theory: behavioral psychology, economics, propositions about the dynamics of influence, and propositions about the structure of small groups.”

“If we wanted to establish the reality of a social system as a complex of mutually dependent elements, why not begin by studying a system small enough so that we could, so to speak, see all the way around it, small enough so that all the relevant observations could be made in detail and at first hand?”

“Institutions are human behavior, and they are, therefore, to be explained by the characteristics of that behavior.”