the sons of God saw that the daughters of man were attractive. And they took as their wives any they chose.
Moses does not condemn beauty itself in the choice of wives, but the raging lust that made it the sole consideration. Marriage is too sacred for men to be swept along by the eyes into fleshly appetite. When we grow so ravished with charm that we ignore what is chief, our appetite becomes brutish; these men chose without discrimination, rushing forward according to lust alone. Temperance in wedlock is required, and its profanation is no light crime before God.
AI summary
The curse of numbers: God's blessing on multiplied mankind became a curse when corruption abused it. Sin is a spreading leprosy, most destructive where sinners crowd together; the multitude of offenders emboldens men. But the greater wickedness here is mixed marriage: the professors of religion, the posterity of Seth, bound themselves to the profane daughters of Cain's line, abandoning their separation unto God.
AI summary
Commenting on Genesis 6:1-2
The sons of God were not angels, incorporeal beings cannot lust or marry, but the godly line of Seth, who from Enos were called by God's name and claimed divine adoption. They regarded only external beauty and lusted after the daughters of Cain, marrying the irreligious without discrimination. This was no light matter; they professed to worship God according to His revealed will, yet abandoned both purity and their detestation of apostasy.
AI summary