Laws should be just, but they must also be certain, and we are obliged to sacrifice something of their justice to their certainty. Suppose a wise and good judge, who paying little or no regard to the law, attempted to decide with perfect justice the cases that were brought before him. To the uneducated person he would appear to be the ideal of a judge. Such justice has been often exercised in primitive times, or at the present day among eastern rulers. But in the first place it depends entirely on the personal character of the judge. He may be honest, but there is no check upon his dishonesty, and his opinion can only be overruled, not by any principle of law, but by the opinion of another judging like himself without law. In the second place, even if he be ever so honest, his mode of deciding questions would introduce an element of uncertainty into human life; no one would know beforehand what would happen to him, or would seek to conform in his conduct to any rule of law. For the compact which the law makes with men, that they shall be protected if they observe the law in their dealings with one another, would have to be substituted another principle of a more general character, that they shall be protected by the law if they act rightly in their dealings with one another. The complexity of human actions and also the uncertainty of their effects would be increased tenfold. For one of the principal advantages of law is not merely that it enforces honesty, but that it makes men act in the same way, and requires them to produce the same evidence of their acts. Too many laws may be the sign of a corrupt and overcivilized state of society, too few are the sign of an uncivilized one; as soon as commerce begins to grow, men make themselves customs which have the validity of laws. Even equity, which is the exception to the law, conforms to fixed rules and lies for the most part within the limits of previous decisions.