Verse 18. Next we have to notice the exuberant testimony to the permanence of the law. Not the smallest of its letters, not even the little marks which distinguished some of them, or the flourishes at the top of some of them, should pass,--as we might say, not even the stroke across a written 't,' which shows that it is not 'l.' The law shall last as long as the world. It shall last till it be accomplished. And what then? The righteousness which it requires can never be so realised that we shall not need to realise it any more, and in the new heavens righteousness dwelleth. But in a very real sense law shall cease when fulfilled. There is no law to him who can say, 'Thy law is within my heart.' When law has become both 'law and impulse,' it has ceased to be law, in so far as it no longer stands over against the doer as an external constraint.
Verse 19. On this permanence of the law Christ builds its imperative authority in His kingdom. Obviously, the 'kingdom of heaven' in verse 19 means the earthly form of that kingdom. The King republishes, as it were, the old code, and adopts it as the basis of His law. He thus assumes the absolute right of determining precedence and dignity in that kingdom. The sovereign is the 'fountain of honour,' whose word ennobles. Observe the merciful accuracy of the language. The breach of the commandments either in theory or in practice does not exclude from the kingdom, for it is, while realised on earth, a kingdom of sinful men aiming after holiness; but the smallest deflection from the law of right, in theory or in practice, does lower a man's standing therein, inasmuch as it makes him less capable of that conformity to the King, and consequent nearness to Him, which determines greatness and smallness there. Dignity in the kingdom depends on Christ-likeness, and Christ-likeness depends on fulfilling, as He did, all righteousness. Small flaws are most dangerous because least noticeable. More Christian men lose their chance of promotion in the kingdom by a multitude of little sins than by single great ones.
Verse 20. As the King has Himself by His perfect obedience fulfilled the law, His subjects likewise must, in their obedience, transcend the righteousness of those who best knew and most punctiliously kept it. The scribes and Pharisees are not here regarded as hypocrites, but taken as types of the highest conformity with the law which the old dispensation afforded. The new kingdom demands a higher, namely a more spiritual and inward righteousness, one corresponding to the profounder meaning which the King gives to the old commandment. And this loftier fulfilment is not merely the condition of dignity in, but of entrance at all into, the kingdom. Inward holiness is the essence of the character of all its subjects. How that holiness is to be ours is not here told, except in so far as it is hinted by the fact that it is regarded as the issue of the King's fulfilling the law. These last words would have been terrible and excluding if they had stood alone. When they follow 'I am come to fulfil,' they are a veiled gospel, implying that by His fulfilment the righteousness of the law is fulfilled in us.
II. We have an illustrative example in the case of the old commandment against murder. This part of the passage falls into three divisions--each occupying two verses. First we have the deepening and expansion of the commandment. This part begins with the royal style again. 'What was said to them of old' is left in its full authority. 'But I say unto you' represents Jesus as possessing co-ordinate authority with that law, of which the speaker is unnamed, perhaps because the same Word of God which now spoke in Him had spoken it. We need but refer here to the Jewish courts and Sanhedrim, and to that valley of Hinnom, where the offal of Jerusalem and the corpses of criminals were burned, nor need we discuss the precise force of 'Raca' and 'thou fool.' The main points to be observed are, the distinct extension of the conception of 'killing' to embrace malevolent anger, whether it find vent or is kept close in the heart; the clear recognition that, whilst the emotion which is the source of the overt act is of the same nature as the act, and that therefore he who 'hateth his brother is a murderer,' there are degrees in criminality, according as the anger remains unexpressed, or finds utterance in more or less bitter and contemptuous language; that consequently there are degrees in the severity of the punishment which is administered by no earthly tribunal; and that, finally, this stern sentence has hidden in it the possibility of forgiveness, inasmuch as the consequence of the sin is liability to punishment, but not necessarily suffering of it. The old law had no such mitigation of its sentence.