So Genesis 6-8 is all about the flood, Gods judgement on a corrupt world. Noah is singledout by God because “Noah found favour in the eyes of the LORD” (6:8). Indeed in the next verse he is described as a righteous man,blameless in his generation.
Now you might think that having been given such high praise God might be pretty pleased with the situation post-flood. We are left with a single group of people, being led by a man who walked with God. It would be easy to think that Gods promise that “I will never again curse the ground because of man” (8:21) flowed out of hope that he would not need to, that man had learnt his lesson from the flood.
This is not the case, 8:21 reads in full
And when the LORD smelledthe pleasing aroma, the LORD said in his heart, “I will never again curse the ground because of man, for the intention of mans heart is evil from his youth.Neither will I ever again strike down every living creature as I have done.
The reason God promised not to curse the earth again because of man was that he looked at Noah and co., and realised that he would have to. Mans heart is evil from his youth, so the corruption of humanity was inevitable.
So often the rainbow is described as a reminder of Gods mercy and grace, and thats brilliant. But lets not forget that it is also a reminder of our corrupt and evil hearts which led to the near destruction of the planet. Praise God that in his mercy he came up with another plan, praise God that he sent his son instead of the second flood we deserved.