Lord Brougham L.C. said (at p. 94),

It seems plain, that the course of justice must stop if such a right exists. No man will dare to consult a professional adviser with a view to his defence or to the enforcement of his rights. The very case which he lays before his counsel, to advise upon the evidence, may, and often does, contain the whole of his evidence, and may be, and frequently is, the brief with which that or some other counsel conducts his cause.

The principle contended for, that inspection of cases, though not of the opinions, may always be obtained as a right, would produce this effect, and neither more nor less, that a party would go into court to try the cause, and there would be the original of his brief in his own counsel’s bag, and a copy of it in the bag of his adversary’s counsel.