John Chrysostom

God's purpose, therefore, was to eliminate all apprehension from Noah's thinking and for him to be quite assured that this would not happen again. He said, remember, "Just as I brought on the deluge out of love, so as to put a stop to their wickedness and prevent their going to further extremes, so in this case too it is out of my love that I promise never to do it again, so that you may live free of all dread and in this way see your present life to its close." Hence he said, "Behold, I make my covenant," that is, I form an agreement. Just as in human affairs when someone makes a promise he forms an agreement and gives a firm guarantee, so too the good Lord said, "Behold, I make my covenant." God did not say that this massive disaster might come again to those who sin. Rather he said, "Behold, I make my covenant with you and your offspring after you." See the Lord's loving kindness: not only with your generation, he says, do I form my agreement, but also in regard to all those coming after you I give this firm guarantee.