A PSYCHOLOGICAL THEORY OF REVOLUTIONS 59
actually occurred in the case of slavery in our country, which institution required a war of essentially revolutionary character for its overthrow. This can happen again in the future; for example, in the relations of the capitalistic and wage-earning classes. Whenever, in fact, an institution or a condition of society is set above public criticism, and freedom of discussion and thought is suppressed concerning it, we have a condition of social inflexibility and a loss of the power of adaptation which may breed revolution. Thus the most that can be said in the way of predicting revolutions must be in very general terms. All that we can say is that some societies are more liable to revolu- tions than others, while no society can safely be judged to be entirely free from the danger of revolution. In other words, no one can say where revolutions will occur, and much less when.
But this negative conclusion regarding the predictability of revolutions is not valueless. If the social sciences cannot foretell social events, they nevertheless can so define the conditions under which they occur that social development can be controlled. Thus it is of value to society to know the general conditions under which revolutions occur; for such knowledge points out the way by which revolutions can be avoided. Surely it cannot be value- less for a society to know that by encouraging intelligent public criticism, free discussion, and free thought about social condi- tions and institutions, by keeping itself adaptable, flexible, alert for betterment, it is pursuing the surest way to avoid future disaster. Social science, if it cannot foretell the future, can nevertheless indicate the way of social health and security.
The important practical truth, then, brought out by this study of revolutions, is that which has been so well expressed by Professor Ward when he says of societies :
Only the labile is truly stable, just as in the domain of living things only the plastic is enduring. For lability is not an exact synonym of instability, but embodies besides the idea of flexibility and susceptibility to change with- out destruction or loss. It is that quality in institutions which enables them to change and still persist, which converts their equilibrium into a moving equilibrium, and which makes possible their adaptation to both internal and external modification, to changes in both individual character and the environment. 5
- Pure Sociology, p. 230.
