To vindicate God's severity, in that he not only cut off sinners—but defaced the beauty of the earth, and swept off the brute creatures from it, by the deluge; that as men had set the marks of their impiety, God might set the marks of his indignation, on the earth. (2.) To show the heinousness of their sin, in making the earth, which God had so adorned for the use of man--a sink of sin, and a stage whereon to act their wickedness, in defiance of Heaven.