Obviously any such change can be only experimental. The lost objective good persists in habit, but it can recur in objective form only through some condition of affairs which has not been yet experienced, and which therefore can be anticipated only uncertainly and inexactly. The essential point is that anticipation should at least guide as well as stimulate effort, that it should be a working hypothesis corrected and developed by events as action proceeds. There was a time when men believed that each object in the external world carried its nature stamped upon it as a form, and that intelligence consisted in simply inspecting and reading off an intrinsic self-enclosed complete nature. The scientific revolution which began in the seventeenth century came through a surrender of this point of view. It began with recognition that every natural object is in truth an event continuous in space and time with other events; and is to be _known_ only by experimental inquiries which will exhibit a multitude of complicated, obscure and minute relationships. Any observed form or object is but a challenge. The case is not otherwise with ideals of justice or peace or human brotherhood, or equality, or order. They too are not things self-enclosed to be known by introspection, as objects were once supposed to be known by rational insight. Like thunderbolts and tubercular disease and the rainbow they can be known only by extensive and minute observation of consequences incurred in action. A false psychology of an isolated self and a subjective morality shuts out from morals the things important to it, acts and habits in their objective consequences. At the same time it misses the point characteristic of the personal subjective aspect of morality: the significance of desire and thought in breaking down old rigidities of habit and preparing the way for acts that re-create an environment. IV