History or custom or social utility or some compelling sense of justice or sometimes perhaps a semi-intuitive apprehension of the pervading spirit of our law must come to the rescue of the anxious judge and tell him where to go.
What has once been settled by a precedent will not be unsettled overnight, for certainty and uniformity are gains not lightly sacrificed. Above all is this true when honest men have shaped their conduct on the faith of the pronouncement.
The great ideals of liberty and equality are preserved against the assaults of opportunism, the expediency of the passing hour, the erosion of small encroachments, the scorn and derision of those who have no patience with general principles.
It is for ordinary minds, not for psychoanalysts, that our rules of evidence are framed. They have their source very often in considerations of administrative convenience, or practical expediency, and not in rules of logic.
