It is worth noticing in the passage before us how the Apostle, starting from abstract ideas, descends, as he becomes more urgent, into personal relations. What fellowship have righteousness and lawlessness? None. What communion has light with darkness? None. What concord has Christ with Belial? Here the persons come in who are the heads, or representatives, of the opposing moral interests, and it is only now that we feel the completeness of the antagonism. The interest of holiness is gathered up in Christ; the interest of evil in the great adversary; and they have nothing in common. And so with the believer and the unbeliever. Of course there is ground on which they can meet: the same sun shines on them, the same soil supports them, they breathe the same air. But in all that is indicated by those two names--believer and unbeliever--they stand quite apart; and the distinction thus indicated reaches deeper than any bond of union. It is not denied that the unbeliever may have much that is admirable about him; but for the believer the one supremely important thing in the world is that which the unbeliever denies, and therefore the more he is in earnest the less can he afford the unbeliever's friendship. We need all the help we can get to fight the good fight of faith, and to perfect holiness in the fear of God; and a friend whose silence numbs faith, or whose words trouble it, is a friend no earnest Christian dare keep. Words like these would not seem so hard if the common faith of Christians were felt to be a real bond of union among them, and if the recoil from the unbelieving world were seen to be the action of the whole Christian society, the instinct of self-preservation in the new Christian life. But, at whatever risk of seeming harsh, it must be repeated that there has never been a state of affairs in the world in which the commandment had no meaning, "Come out from among them, and be ye separate"; nor an obedience to this commandment which did not involve separation from persons as well as from principles.
(3) But what bulks most largely in the passage is the series of divine promises which are to inspire and sustain obedience. The separations which an earnest Christian life requires are not without their compensation; to leave the world is to be welcomed by God. It is probable that the pernicious association which the writer had immediately in view was association with the heathen in their worship, or at least in their sacrificial feasts. At all events it is the inconsistency of this with the worship of the true God that forms the climax of his expostulation--What agreement hath a temple of God with idols? and it is to this, again, that the encouraging promises are attached. "_We_," says the Apostle, "are a temple of the living God." This carries with it all that he has claimed: for a temple means a house in which God dwells, and God can only dwell in a holy place. Pagans and Jews alike recognised the sanctity of their temples: nothing was guarded more jealously; nothing, if violated, was more promptly and terribly avenged. Paul had seen the day when he gave his vote to shed the blood of a man who had spoken disrespectfully of the Temple at Jerusalem, and the day was coming when he himself was to run the risk of his life on the mere suspicion that he had taken a pagan into the holy place. He expects Christians to be as much in earnest as Jews to keep the sanctity of God's house inviolate; and now, he says, that house are we: it is ourselves we have to keep unspotted from the world.