These eight beatitudes are the diatonic scale of heaven's music. Its key-note is blessing; its upper octave, joy. Those who heard it first with quickened souls could no longer doubt that the kingdom of heaven was at hand; indeed, was there on the mountain that day!
2. _In relation to the world_ (vv. 13-16).
The original promise to Abraham was twofold: "I will bless thee," "Thou shalt be a blessing" (Gen. xii. 2). The beatitudes correspond to the former, the passage before us to the latter. The beatitudes are, so to speak, the home affairs of the kingdom of heaven; the passage which follows is occupied with foreign relations. Those spoke of blessedness within, this speaks of usefulness without; for the disciples of Christ are known not only by their personal character and disposition, but also by their influence on others.
The relations of the members of the kingdom to "those that are without" is a complex and difficult subject; but the essence of it is set forth with surpassing clearness, comprehensiveness and simplicity by the use of two unpretentious but most expressive figures, almost infinite in their suggestiveness--salt and light. This is our first experience of a well-known characteristic of the teaching of Christ--viz., His use of the simplest and most familiar objects of nature and circumstances of daily life, to convey highest and most important truth; and at once we recognise the touch of the Master. We cannot fail to see that out of all nature's infinity He has selected the two illustrations,--the only two, which exactly fit and fill the purpose for which He employs them. To the thoughtful mind there is something here which prepares for such tokens of mastery over nature as are found later on in the hushing of the storm and the stilling of the sea.
"Salt" suggests the conservative, "light" the liberal, side of the politics of the kingdom; but the two are not in opposition, they are in fullest harmony, the one being the complement of the other. Christian people, if they are what they profess to be, are all conservatives and all liberals: conservators of all that is good, and diffusers of all that is of the nature of light. Each of these sides of Christian influence is presented in succession.
"_Ye are the salt of the earth._" The metaphor suggests the sad fact that, whatever tendency to upward development there may be in the world of nature, there is a contrary tendency in the world of men, so far as character is concerned. The world has often made great advances in civilisation; but these, unless counter-acted by forces from above, have always been accompanied by a degeneracy in morals, which in course of time has brought about the ruin of mighty states. All that is best and most hopeful in mere worldly civilisation has in it the canker of moral evil,
"That rotting inward slowly moulders all."
The only possible counteractive is the introduction of an element into society which will hold in check the forces that make for unrighteousness, and be itself an elevating and purifying influence. Such an element Christians were to be in the world.
Such, to a large extent, they have been. That they were the salt of the Roman empire during the evil days of its decline, no student of history can fail to see. Again, in the "dark ages" that followed, we can still trace the sweetening influence of those holy lives which were scattered like shining grains of salt through the ferment and seething of the times. So it has been throughout, and is still. It is true that there is no longer the sharp distinction between Christians and the world which there was in days when it cost something to confess Christ. There are now so many Christians in name who are not so in reality, and, on the other hand, so many in reality who are not so in name, and moreover so many who are Christians neither in name nor in reality, but who are nevertheless unconsciously guided by Christian principles as the result of the wide diffusion of Christian thought and sentiment--that the conservative influence of distinctive Christianity is very difficult to estimate and is far less appreciated than it should be. But it is as real and efficient as ever. If Christianity, as a conservative force in society, were to be suddenly eliminated, the social fabric would fall in ruins; but if only the salt were all genuine, if Christian people everywhere had the savour of the eight beatitudes about them, their conservative power as to all that is good, and restraining influence as to all that is evil, would be so manifest and mighty that none could question it.