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Rh sometimes exercise the privilege of overruling their own decisions. Those, I think, are the conclusions to which a sense of realism must lead us. No doubt there is a field within which judicial judgement moves untrammeled by fixed principles. Obscurity of statute or of precedent or of customs or of morals, or collision between some or all of them, may leave the law unsettled, and cast a duty upon the courts to declare it retrospectively in the exercise of a power frankly legislative in function. In such cases, all that the parties to the controversy can do is to forecast the declaration of the rule as best they can, and govern themselves accordingly. We must not let these occasional and relatively rare instances blind our eyes to the innumerable instances where there is neither obscurity nor collision nor opportunity for diverse judgment. Most of us live our lives in conscious submission to rules of law, yet without necessity of resort to the courts to ascertain our rights and duties. Lawsuits are rare and catastrophic experiences for the vast majority of men, and even when the Rh