16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
17 And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.
18 And unto Enoch was born Irad: and Irad begat Mehujael: and Mehujael begat Methusael: and Methusael begat Lamech.
19 And Lamech took unto him two wives: the name of the one was Adah, and the name of the other Zillah.
20 And Adah bare Jabal: he was the father of such as dwell in tents, and of such as have cattle.
21 And his brother's name was Jubal: he was the father of all such as handle the harp and organ.
22 And Zillah, she also bare Tubal-cain, an instructer of every artificer in brass and iron: and the sister of Tubal-cain was Naamah.
23 And Lamech said unto his wives, Adah and Zillah, Hear my voice; ye wives of Lamech, hearken unto my speech: for I have slain a man to my wounding, and a young man to my hurt.
24 If Cain shall be avenged sevenfold, truly Lamech seventy and sevenfold.
25 And Adam knew his wife again; and she bare a son, and called his name Seth: For God, said she, hath appointed me another seed instead of Abel, whom Cain slew.
26 And to Seth, to him also there was born a son; and he called his name Enos: then began men to call upon the name of the LORD.
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The main occupation of Cain's descendants becomes the creation of civilization: they build cities and develop crafts, trade, and art. So is it really necessary to commit fratricide first in order to create civilization? Can civilization be built only on blood, and does it itself require blood?
It is not quite that after all. Perhaps the question is why civilization is created. The answer would seem clear: to make life more comfortable and safer. At first glance, cities, the development of crafts, and the appearance of art all serve precisely these goals. If not for one small episode with Lamech, who boasts that he avenged the injury done to him in such a way that no one would ever again even think of daring anything like it. And here the reverse side of civilization shows through, the side soaked in blood.
It would seem Lamech was not the first to begin. He only struck back. But he struck with all his might, wildly, not in order to defend himself, but in order to kill, to destroy the enemy, to destroy him as an example to anyone who would dare attack. This is no longer self-defense, but vengeance: vengeance not only for himself, but also for Cain, who had had to humble himself and ask God for protection (for someone who, like Cain, considers God an enemy and a merciless judge, such a request cannot but be humiliating).
Self-assertion grounded in force and vengeance - this is the spiritual foundation of fallen civilization. It is no surprise that its history begins with fratricide. It is not hard to guess what its end can be.