Genesis 4:24

If Cain shall be avenged sevenfold, truly, Lamech seventy and sevenfold. Here is the first instance of the art of poetry, but even this is placed into the service of sin; for this is the form of the poem:

Adah and Zillah, hear my voice;

Ye wives of Lamech, listen to my speech;

For a man have I killed for my wound and a young man for my welt;

For sevenfold will Cain be avenged, and Lamech seven and seventy fold.

Thus Lamech boastfully sang in praise of his son's invention which had enabled him to take quick vengeance on some man with whom he had had a quarrel and who managed to wound him. Far from feeling any remorse over his deed, he glorifies the name of his forefather Cain, whom the Lord had given the assurance that He would avenge him in case any one should dare to harm him, and claims for himself a much greater glory for his murder. That reveals the depravity of the children of the world as it had fully developed in the age of Lamech. And thus today also the culture of the world does not hinder sin, but offers new opportunities to it. Arts and crafts, commerce, industry, they all are in the service of mammon, they all are used to harm one's neighbor.