Q: How, then, is it a token that there shall never be a flood to destroy the earth?
A: Easily and naturally enough; for, whenever a rainbow is seen
anywhere on earth, that is certain witness that the sun is shining somewhere on earth.
And when the sun is shining anywhere on earth, that is certain evidence that the rain is not falling everywhere on earth, so certainly there is no danger of there being a flood to cover the world as there was before.
And as certainly as the cloud with its rain does not cover all the earth at once, so certainly the sun is shining somewhere on the earth, and so certainly there will be a rainbow, and in it the faithfulness of God’s pledge that there shall no more be a flood to destroy the earth."
A.T. Jones
Genesis 9:8 And God spoke unto Noah, and to his sons with him saying,
Genesis 9:8 And God spoke unto Noah, and to his sons with him saying,
9 And behold, I establish My covenant with you, and with your seed after you;
10 And with every living creature that is with you, of the fowl, of the cattle, and of every beast of the earth.
11 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.
12 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:
13 I do set My bow in the cloud, and it shall be for a token of a covenant between Me and the earth. 
14 And it shall come to pass, when I bring a cloud over the earth, that the bow shall be seen in the cloud:
15 And I will remember My covenant, which is between Me and you and ever living creature of all flesh; and the waters shall no more become a flood to destroy all flesh.
16 And the bow shall be seen 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.
17 And God said unto Noah, This is the token of the covenant which I have established between Me and all flesh that is upon the earth.
