"A counsel's position is one of the utmost difficulty. He is not to speak of that which he knows; he is not called upon to consider whether the facts with which he is dealing are true or false. What he has to do, is to argue as best he can, without degrading himself, in order to maintain the proposition which will carry with it either the protection or the remedy which he desires for his client. If amidst the difficulties of his position he were to be called upon during the heat of his argument to consider whether what he says is true or false, whether what he says is relevant or irrelevant, he would have his mind so embarrassed that he could not do the duty which he is called upon to perform. For, more than a Judge, infinitely more than a witness, he wants protection on the ground of benefit to the public. The rule of law is that what is said in the course of the administration of the law is privileged; and the reason of that rule covers a counsel even more than a Judge or a witness."