Noah did not forget God, who had so graciously preserved them, but immediately erected an altar and took of every clean beast, and of every clean fowl, and offered burnt offerings on the altar, showing his faith in Christ the great sacrifice, and manifesting his gratitude to God for their wonderful preservation. The offering of Noah came up before God like a sweet savor. He accepted the offering and blessed Noah and his family. Here a lesson is taught all who should live upon the earth, that for every manifestation of God's mercy and love toward them the first act of all should be to render to Him grateful thanks and humble worship. SR 69.3
And lest man should be terrified with gathering clouds and falling rains, and should be in continual dread, fearing another flood, God graciously encourages the family of Noah by a promise. “And I will establish My covenant with you; neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the earth. And God said, This is the token of the covenant which I make between Me and you and every living creature that is with you, for perpetual generations: I do set My bow in the cloud, and it shall be for a token of a covenant between Me and the earth. And it shall come to pass, when I bring a cloud over the earth, that the bow shall be seen in the cloud.... And the bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant between God and every living creature of all flesh that is upon the earth.” SR 70.1
What a condescension on the part of God! What compassion for erring man, to place the beautiful, variegated rainbow in the clouds, a token of the covenant of the great God with man! This rainbow was to evidence the fact to all generations that God destroyed the inhabitants of the earth by a flood, because of their great wickedness. It was His design that as the children of aftergenerations should see the bow in the cloud and should inquire the reason of this glorious arch that spanned the heavens, their parents could explain to them the destruction of the old world by a flood, because the people gave themselves up to all manner of wickedness, and that the hands of the Most High had bent the bow and placed it in the clouds as a token that He would never again bring a flood of waters on the earth. SR 70.2
This symbol in the clouds is to confirm the belief of all, and establish their confidence in God, for it is a token of divine mercy and goodness to man; that although God had been provoked to destroy the earth by the Flood, yet His mercy still encompasseth the earth. God says when He looketh upon the bow in the cloud He will remember. He would not have us understand that He would ever forget, but He speaks to man in his own language, that man may better understand Him. SR 71.1