Eventually we would grow accustomed to them. We would even come to expect them, count on them...maybe even take them for granted. Alas, they would no longer be special. They would fade into the background of daily life and we wouldn't take scarcely a notice.
Well, that tears it. Maybe Hawaii has rainbows all the time. But that's Hawaii. Here rainbows are still special. They come near the end of the storm. In the Bible they represent God's promise to mankind He will never again flood the earth. Rainbows are ephemeral and fleeting and must be enjoyed while they last. Somewhere over the rainbow bluebirds may fly, but in the here and now, rainbows are heaven-sent.