For the glory of God's justice, and for warning to a wicked world, before the history of the ruin of the old world, we have a full account of its degeneracy, its apostasy from God and rebellion against him. The destroying of it was an act, not of an absolute sovereignty, but of necessary justice, for the maintaining of the honour of God's government. Now here we have an account of two things which occasioned the wickedness of the old world: - 1. The increase of mankind: Men began to multiply upon the face of the earth. This was the effect of the blessing (Gen 1:28), and yet man's corruption so abused and perverted this blessing that it was turned into a curse. Thus sin takes occasion by the mercies of God to be the more exceedingly sinful. Pro 29:16, When the wicked are multiplied, transgression increaseth. The more sinners the more sin; and the multitude of offenders emboldens men. Infectious diseases are most destructive in populous cities; and sin is a spreading leprosy. Thus in the New Testament church, when the number of the disciples was multiplied, there arose a murmuring (Act 6:1), and we read of a nation that was multiplied, not to the increase of their joy, Isa 9:3. Numerous families need to be well-governed, lest they become wicked families. 2. Mixed marriages (Gen 6:2): The sons of God (that is, the professors of religion, who were called by the name of the Lord, and called upon that name), married the daughters of men, that is, those that were profane, and strangers to God and godliness. The posterity of Seth did not keep by themselves, as they ought to have done, both for the preservation of their own purity and in detestation of the apostasy. They intermingled themselves with the excommunicated race of Cain: They took them wives of all that they chose. But what was amiss in these marriages? (1.) They chose only by the eye: They saw that they were fair, which was all they looked at. (2.) They followed the choice which their own corrupt affections made: they took all that they chose, without advice and consideration. But, (3.) That which proved of such bad consequence to them was that they married strange wives, were unequally yoked with unbelievers, Co2 6:14. This was forbidden to Israel, Deu 7:3, Deu 7:4. It was the unhappy occasion of Solomon's apostasy (Kg1 11:1-4), and was of bad consequence to the Jews after their return out of Babylon, Ezr 9:1, Ezr 9:2. Note, Professors of religion, in marrying both themselves and their children, should make conscience of keeping within the bounds of profession. The bad will sooner debauch the good than the good reform the bad. Those that profess themselves the children of God must not marry without his consent, which they have not if they join in affinity with his enemies.

When men began to multiply - It was not at this time that men began to multiply, but the inspired penman speaks now of a fact which had taken place long before. As there is a distinction made here between men and those called the sons of God, it is generally supposed that the immediate posterity of Cain and that of Seth are intended. The first were mere men, such as fallen nature may produce, degenerate sons of a degenerate father, governed by the desire of the flesh, the desire of the eye, and the pride of life. The others were sons of God, not angels, as some have dreamed, but such as were, according to our Lord's doctrine, born again, born from above, Joh 3:3, Joh 3:5,Joh 3:6, etc., and made children of God by the influence of the Holy Spirit, Gal 5:6. The former were apostates from the true religion, the latter were those among whom it was preserved and cultivated. Dr. Wall supposes the first verses of this chapter should be paraphrased thus: "When men began to multiply on the earth, the chief men took wives of all the handsome poor women they chose. There were tyrants in the earth in those days; and also after the antediluvian days powerful men had unlawful connections with the inferior women, and the children which sprang from this illicit commerce were the renowned heroes of antiquity, of whom the heathens made their gods."

That the sons of God saw the daughters of men, that they were fair,.... Or "good" (k), not in a moral but natural sense; goodly to look upon, of a beautiful aspect; and they looked upon, and only regarded their external beauty, and lusted after them: those "sons of God" were not angels either good or bad, as many have thought, since they are incorporeal beings, and cannot be affected with fleshly lusts, or marry and be given in marriage, or generate and be generated; nor the sons of judges, magistrates, and great personages, nor they themselves, as the Targums of Onkelos and Jonathan, and so Jarchi and Aben Ezra; but this could be no crime in them, to look upon and take in marriage such persons, though they were the daughters of the meaner sort; and supposing they acted a criminal part in looking at them, and lusting after them, and committing fornication with them, and even in marrying irreligious persons; yet this could only be a partial, not an universal corruption, as is after affirmed, though such examples must indeed have great influence upon the populace; but rather this is to be understood of the posterity of Seth, who from the times of Enos, when then began to be called by the name of the Lord, Gen 4:25 had the title of the sons of God, in distinction from the children of men; these claimed the privilege of divine adoption, and professed to be born of God, and partakers of his grace, and pretended to worship him according to his will, so far as revealed to them, and to fear and serve and glorify him. According to the Arabic writers (l), immediately after the death of Adam the family of Seth was separated from the family of Cain; Seth took his sons and their wives to a high mountain (Hermon), on the top of which Adam was buried, and Cain and all his sons lived in the valley beneath, where Abel was slain; and they on the mountain obtained a name for holiness and purity, and were so near the angels that they could hear their voices and join their hymns with them; and they, their wives and their children, went by the common name of the sons of God: and now these were adjured, by Seth and by succeeding patriarchs, by no means to go down from the mountain and join the Cainites; but notwithstanding in the times of Jared some did go down, it seems; See Gill on Gen 5:20 and after that others, and at this time it became general; and being taken with the beauty of the daughters of Cain and his posterity, they did as follows:

and they took them wives of all that they chose; not by force, as Aben Ezra and Ben Gersom interpret, for the Cainites being more numerous and powerful than they, it can hardly be thought that the one would attempt it, or the other suffer it; but they intermarried with them, which the Cainites might not be averse unto; they took to them wives as they fancied, which were pleasing to the flesh, without regard to their moral and civil character, and without the advice and consent of their parents, and without consulting God and his will in the matter; or they took women as they pleased, and were to their liking, and committed fornication, to which the Cainites were addicted; for they spent their time in singing and dancing, and in uncleanness, whereby the posterity of Seth or sons of God were allured to come down and join them, and commit fornication with them, as the Arabic writers (m) relate.

(k) Sept, "bonae" Cocceius. (l) Elmacinus, Patricides apud Hottinger. Smegma, l. 1. c. viii. p. 226, 227, 228. (m) Elmacinus, Patricides apud Hottinger. Smegma, l. 1. c. viii. p. 232, 235, 236, 242, 247.