The Rainbow Covenant was a promise to prevent evil from getting too strong. This covenant was the first crack in the wall of the defence that the powers of evil had placed round the world. They had shut God out of his creation, and stuffed it up. Noah opened the door a chink, and let God back in.
God used Noah to make put in place another important tool for dealing with evil. The covenant that God made with Noah allows him to bring protective judgments on earth, during times of serious evil, without getting permission from a prophet. This allows God to act against evil in a season when there are no prophets.
This rainbow covenant is different from other covenants, because it was not exclusive, but applies to all people and animals on the earth.Whenever the rainbow appears in the clouds, I will see it and remember the everlasting covenant between God and all living creatures of every kind on the earth (Gen 9:16).
The rainbow reminds us of covenant with all people forever. The rainbow covenant is unconditional. No conditions are specified for fulfilling the covenant. No consequences were specified for failure to keep the covenant. The covenant with Noah is and unconditional promise to all the people of the earth through all time.
The common understanding is that God was promising not to destroy the earth by another flood. This does not seem very likely anyway, so this view makes the covenant seem irrelevant. We do not see a rainbow and think, “Wow, I am glad that God is keeping his covenant”. Christians assume we have a better covenant and do not need this old one, but we have missed the significance of God’s promise. God was not promising there would never be another flood. He was actually promising that he would not need to send another flood, because he would never let conditions get so bad on earth that it needed to be destroyed. God promised to prevent evil from getting so strong that it has potential to destroy the entire earth.
God was able to make this promise, because the covenant with Noah increased God’s authority on earth. God had given authority over the earth to man, so he could not intervene on earth without getting permission. The Rainbow Covenant God gave him permission to intervene on earth when evil was getting out of hand. This covenant was a serious crack in the wall of the defence that the powers of evil had placed round the world. They had shut God out of his creation, and stuffed it up. Noah opened the door a chink, and let God back in.
Noah was the father of all who would live on earth after him, so his covenant binds everyone on earth. Speaking on behalf of his descendants, Noah gave God permission to intervene when evil is rampant. The Covenant of the Rainbow gave God long-term permission to act on earth, if things got really bad. This was not much of a constraint on human authority on earth, because it does not apply most of the time, but it give a God authority to act on earth, if becomes strong and destructive. This permission still applies several thousand years later.
This was a long-term permission, because Noah agreed and gave God permission on behalf of his descendants. God still has permission to intervene in the world when evil gets out of hand. This is the promise of the rainbow. It was not much of a constraint on human authority on earth, because it did not apply most of the time, but it gave God authority to act on earth, when things got really bad.
The rainbow covenant was a huge step in the battle against evil. Until the time of Noah, God was shut out of the world and could do nothing to prevent evil from destroying the world. The rainbow covenant did not give God a free hand on earth. Most of the time, it does not apply, because the situation is not bad enough. However, it does give God permission to intervene on earth when evil gets really bad. This is a great improvement over the situation that existed before the Flood.