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.

This comes in here as a token of God's displeasure at those who married strange wives; he threatens to withdraw from them his Spirit, whom they had grieved by such marriages, contrary to their convictions: fleshly lusts are often punished with spiritual judgments, the sorest of all judgments. Or as another occasion of the great wickedness of the old world; the Spirit of the Lord, being provoked by their resistance of his motions, ceased to strive with them, and then all religion was soon lost among them. This he warns them of before, that they might not further vex his Holy Spirit, but by their prayers might stay him with them. Observe in this verse, I. God's resolution not always to strive with man by his Spirit. The Spirit then strove by Noah's preaching (Pe1 3:19, Pe1 3:20) and by inward checks, but it was in vain with the most of men; therefore, says God, He shall not always strive. Note, 1. The blessed Spirit strives with sinners, by the convictions and admonitions of conscience, to turn them from sin to God. 2. If the Spirit be resisted, quenched, and striven against, though he strive long, he will not strive always, Hos 4:17. 3. Those are ripening apace for ruin whom the Spirit of grace has left off striving with. II. The reason of this resolution: For that he also is flesh, that is, incurably corrupt, and carnal, and sensual, so that it is labour lost to strive with him. Can the Ethiopian change his skin? He also, that is, All, one as well as another, they have all sunk into the mire of flesh. Note, 1. It is the corrupt nature, and the inclination of the soul towards the flesh, that oppose the Spirit's strivings and render them ineffectual. 2. When a sinner has long adhered to that interest, and sided with the flesh against the Spirit, the Spirit justly withdraws his agency, and strives no more. None lose the Spirit's strivings but those that have first forfeited them. III. A reprieve granted, notwithstanding: Yet his days shall be one hundred and twenty years; so long I will defer the judgment they deserve, and give them space to prevent it by their repentance and reformation. Justice said, Cut them down; but mercy interceded, Lord, let them alone this year also; and so far mercy prevailed, that a reprieve was obtained for six-score years. Note, The time of God's patience and forbearance towards provoking sinners is sometimes long, but always limited: reprieves are not pardons; though God bear a great while, he will not bear always.