by jimwalton » Sun Feb 04, 2018 10:07 pm
Let's talk about Cain's curse first. He was driven fro the land, meaning that he is barred from the enjoyment of its productivity. The land will no longer produce for him (i.e., he'll be an unproductive farmer), and therefore he will be forced to wander to get food. The punishment fits the crime: He has polluted the land with Abel's blood, and therefore the land will be too polluted to produce sustaining food for him. He ruined it, and so it shall be ruined.
Also, as a restless wanderer, he will lose all sense of belonging and identification with a community. Again the punishment fits the crime. He killed family, and therefore he will be "dead" to family. He will be rootless and detached.
Therefore he will be somewhat unprotected. The punishment fits the crime: He killed his brother when Abel was unprotected. Therefore he fears he will be killed (Gn. 4.14) as his brother was killed.
But God shows mercy for him also. First of all, he didn't execute Cain on the spot. Therefore Cain has an opportunity to repent of his sins and restore his relationship with God, if he ever chooses to do that. Second, God gives him a promise of safe passage. He will protect Cain from people like himself—murderers.
"Seven times over." This doesn’t mean that anyone who kills Cain will be killed seven times, but is a Hebrew figure of speech—when something is to be done sevenfold, that means it will surely happen.
Second, let's talk about Lamech. By the time we get to Lamech in Gn. 4.23, we see how sin has so infiltrated the human heart and corrupted humanity. Now, Lamech brags, if provoked, Lamech would not hesitate to kill even a child, let alone an adult. His capacity for retaliation is unbalanced and nondiscriminatory. He's just a violent jerk. He boasts of the inordinate range of his violent capabilities. Whereas Cain felt vulnerable, Lamech considers himself to be self-sufficient. He has no scruples about taking the law into his own hands and won't hesitate to kill for the slightest infraction.
Lamech is yet another clue, a forerunner, to the statement we'll read in Genesis 6.5 that people had become hopelessly corrupt and irredeemably evil.