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same thing for successive generations? May restraints that were arbitrary yesterday be useful and rational and therefore lawful today? May restraints that are arbitrary today become useful and rational and therefore lawful tomorrow? I have no doubt that the answer to these questions must be yes. There were times in our judicial history when the answer might have been no. Liberty was conceived of at first as something static and absolute. The Declaration of Independence had enshrined it. The blood of Revolution had sanctified it. The political philosophy of Rousseau and of Locke and later of Herbert Spencer and of the Manchester school of economists had dignified and rationalized it. Laissez faire was not only a counsel of caution which statesmen would do well to heed. It was a categorical imperative which statesmen, as well as judges, must obey. The "nineteenth century theory" was "one of eternal legal conceptions involved in the very idea of justice and containing potentially an exact rule for every case to be reached by an absolute process of logical deduc-