The rainbow shall be in the cloud, and I will look on it to remember the everlasting covenant between God and every living creature of all flesh that is on the earth.
Genesis 9:16

One cannot help but be fascinated each time one sees a rainbow. Of course, the double rainbow even seems more fascinating and will cause you to stop and re-examine the beauty of a rainbow. From the simple little rhyme, “Rainbow in the morning, sailor take warning; rainbow at night, sailors delight.” to the little thought that “at the end of every rainbow is a pot of gold”, we obviously note the attention it draws to itself. A more beautiful setting for a rainbow has never been found than over the Copper River Basin (Alaska) in the fall. Yet, the complete circle of the rainbow, when viewed from an airplane, is breathtaking.
All of this leads me to comment concerning the rainbow of promise recorded in Genesis 9:13cf. After the destruction of the world by the flood, God used the rainbow to be the seal of a covenant between God and all flesh upon the earth. God would never again destroy the earth in that fashion. As proof of the promise, He said that each time He sees it, (Gen. 9:16) He will be reminded of that promise.
It is great to view a rainbow, but it is more comforting to know that God views it. To realize that this particular covenant is a perpetual covenant, with no strings attached, is stimulating! Because of the earth’s ability to restore and regenerate itself following the flood, and because in the process sin would again be dominant and rampant as in this day, God has declared that the final judgment will be that of fire. (2 Peter 3:7) Then, God will make all things over. A new man, sin-free, will live in a new world created anew by our God. A remarkable promise… that bow in the sky. Nevertheless, it constitutes accountability on the part of God to man and man to God. (Rev. 4:3)