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2. For, behold, darkness shall cover the earth. He now exhibits in a stronger light, by means of comparison, that grace which he formerly mentioned; that we may form some idea how much God loves his elect, and how extraordinary is the privilege which he bestows upon them. The amount of what he says is, that, while we are weighed down by innumerable afflictions, and while the whole world, as it were, sinks under them, God will take care of his people., in order to enrich them with various benefits. He shows, therefore, that the light of grace and favor, which he mentioned, will not be indiscriminately enjoyed by all, but will be peculiar to the people of God.

We have said that the word “brightness” denotes a prosperous condition of the Church; but let us not judge of this condition from outward appearance; for the Prophet rises higher, and I have no doubt that his discourse relates to spiritual light and brightness. Otherwise that mode of expression which he afterwards employs, “The Gentiles shall walk to thy brightness,” (verse 3) would not be appropriate. Besides, this is clearly demonstrated by the connection between this chapter and the preceding; for he says that this covenant is continued in the word and Spirit. Finally, from the contrast it may easily be inferred that the happiness promised to the Church is different from that which consists in meat and drink, or tranquillity and peace, and other conveniences; and indeed never afterwards was there any period in which the darkness of afflictions overwhelmed all the Gentiles, while the Jews enjoyed peace and prosperity. Since, therefore, the condition of the Church is separated from the whole world, that benefit which Isaiah puts into the possession of the Church is spiritual, and the brightness which he promises is spiritual; and consequently, these things relate to the spiritual kingdom of Christ, when the light of the Gospel shone in every part of the world, and foreign nations were enlightened by it. To this also relates what follows, —

The Lord will arise upon thee; for although he shows that the favor of God will be visible by manifest tokens and effects, yet he does not leave out that which is of the greatest importance, that believers will truly feel that he is their Father, so as to expect salvation from him. Hence infer that we are overwhelmed by darkness till God shine upon us with the testimony of adoption by free grace. I speak of all mankind; for Isaiah informs us that this life-giving light proceeds from God alone, in order to declare that it is a special gift of God.

Secondly, it ought to be observed that the Church alone, that is, the elect of God, are partakers of this brightness. Hence it follows, that it is not a common or natural gift, but a gift by which the Lord relieves us from an ordinary defect of human nature. Thus also we perceive that there is no light or brightness but in the Church; for the rest of men, though they think that they enjoy light and brightness, are overwhelmed by darkness, from which they cannot be extricated in any other way than by the light of the Gospel.

And his glory shall be seen upon thee. He adds the word “glory,” because, after having embraced us by his favor, the Lord continues more and more to increase his acts of kindness toward us.

3. And the Gentiles shall walk. He confirms what we have already said, that there is no other light of men but when the Lord shines on them by his word. All indeed acknowledge this; but they do not set so high a value as they ought on this benefit, and imagine it to be something of an ordinary kind, which naturally belongs to all men. But he shows that this grace is supernatural, and therefore it ought to be distinguished from nature; which is clearly shown by the repetition of the words upon thee, in the preceding verse.

First, then, we ought to believe that this benefit comes from God alone; and secondly, that all are not indiscriminately partakers of it, but only the elect, on whom the Lord shines by undeserved favor, so as to take them out of the ordinary rank of men. This is done by Christ, who is called “the Sun of Righteousness,” because we are enlightened as if by his rays. (Malachi 4:2) Besides, the Prophet declares that this favor shall be spread far and wide by the Jews; which is also intimated by the words of the covenant,

“In thy seed shall all nations be blessed.” (Genesis 22:18)

To thy brightness. If one nation only had enjoyed the light, it would have been of no advantage to the rest; but, so far as the doctrine of the Gospel has been spread throughout the whole world, Judea has held out the light to the Gentiles formerly blinded, in order to point out the way. By making the brightness peculiar to a single nation, he shows that in no other way could the world be enlightened, or come to share in this benefit, than by seeking light from that word which proceeded from the Jews, and was heard at Jerusalem, where the lamp of the Lord was kindled, and where the Sun of Righteousness arose, that from it he might diffuse his light to all the ends of the earth, as we have formerly seen, “Out of Zion shall go forth the Law.” (Isaiah 2:3) There is, therefore, no light but from the doctrine of the prophets; so that they who withdraw from it falsely boast of walking in the light.

And kings to the brightness of thy rising. He alludes to the dawn; for, as the morning­star begins the day in one quarter only of heaven, and immediately the sun enlightens the whole world, so the daybreak was first in Judea, from which the light arose and was afterwards diffused throughout the whole world; for there is no corner of the earth which the Lord has not enlightened by this light. He mentions “kings,” that they might not imagine that none but the common people would come to this light, but princes and nobles, who in other respects are greatly delighted with their high rank. But now he confers on the Church the very highest honor, that she shines with such brightness as to attract to herself nations and princes. He calls it “the light” of the Church; not that she has any light from herself, but borrows it from Christ, as the moon borrows from the sun.