Next comes the crime of perjury--a compound sin, which breaks at the same time two commandments of the Decalogue, the third and the ninth. Here, again, our Lord shows that, if only due homage is paid in the heart to reverence and to truth, all swearing is superseded. Let a man habitually live in the fear of the Lord all the day long, and "his word is as good as his oath"--he will always speak the truth, and will be incapable of taking the name of the Lord in vain. It is of course to be remembered that these are the laws of the kingdom of Christ; not laws meant for the kingdoms of this world, which have to do with men of all sorts, but for a kingdom made up of those who hunger and thirst after righteousness, who seek and find purity of heart. This passage accordingly has no bearing on the procedure of secular courts of justice. But, though the use of oaths may still be a necessity in the world, in the kingdom of heaven they have no place. The simple "Yea, yea," "Nay, nay," is quite enough where there is truth in the inward parts and the fear of God before the eyes; and the feeling of reverence, not only for God Himself but for all the works of His hands, will effectually prevent the most distant approach to profanity. The sin of revenge furnishes the next illustration. The Pharisaic perversion of the old law actually sanctioned private revenge, on the ground of a statute intended for the guidance of the courts of justice, and given for the sake of curbing the revengeful spirit which without it would lead a prosecutor to demand that his enemy should suffer more than he had inflicted. In this way they really destroyed that part of the Mosaic legislation, whereas He fulfilled it by developing still further,--bringing, in fact, to perfection,--that spirit of humanity which had dictated the law at the first. The true spirit of the Mosaic legislation was to discourage private revenge by assigning such cases to the courts, and curbing it still further by the limitation of the penalty imposed. Was not this spirit most nobly fulfilled, carried to its highest development, when the Saviour laid it down as the law of His kingdom that our revenge is to be the returning of good for evil?