"It is the province of the statesman and not the lawyer to discuss, and of the legislature to determine, what is the best for the public good, and to provide for it by proper enactments. It is the province of the Judge to expound the law only—the written from the statute, the unwritten or common law from the decisions of our predecessors and of our existing Courts—from the text-writers of acknowledged authority, and upon the principles to be clearly deduced from them by sound reason and just inference—not to speculate upon what is the best, in his opinion, for the advantage of the community."