This covenant with Noah was on the plane of nature. It is man's natural life in the world which is the subject of it. The sacredness of life is its great lesson. Men might well wonder whether God did not hold life cheap. In the old world violence had prevailed. But while Lamech's sword may have slain its thousands, God had in the Flood slain tens of thousands. The covenant, therefore, directs that human life must be reverenced. The primal blessing is renewed. Men are to multiply and replenish the earth; and the slaughter of a man was to be reckoned a capital crime; and the maintenance of life was guaranteed by a special clause, securing the regularity of the seasons. If, then, you ask, Was this just a beginning again where Adam began? Did God just wipe out man as a boy wipes his slate clean, when he finds his calculation is turning out wrong? Had all these generations learned nothing; had the world not grown at all since its birth?--the answer is, it had grown, and in two most important respects,--it had come to the knowledge of the uniformity of nature, and the necessity of human law. This great departure from the uniformity of nature brought into strong relief its normal uniformity, and gave men their first lesson in the recognition of a God who governs by fixed laws. And they learned also from the Flood that wickedness must not be allowed to grow unchecked and attain dimensions which nothing short of a flood can cope with.
Fit symbol of this covenant was the rainbow. Seeming to unite heaven and earth, it pictured to those primitive people the friendliness existing between God and man. Many nations have looked upon it as not merely one of the most beautiful and striking objects in nature, but as the messenger of heaven to men. And arching over the whole horizon, it exhibits the all-embracing universality of the promise. They accepted it as a sign that God has no pleasure in destruction, that He does not give way to moods, that He does not always chide, that if weeping may endure for a night joy is sure to follow. If any one is under a cloud, leading a joyless, hopeless, heartless life, if any one has much apparent reason to suppose that God has given him up to catastrophe, and lets things run as they may, there is some satisfaction in reading this natural emblem and recognising that without the cloud, nay, without the cloud breaking into heavy sweeping rains, there cannot be the bow, and that no cloud of God's sending is permanent, but will one day give place to unclouded joy. Let the prayer of David be yours, "I know, O Lord, that Thy judgments are right, and that Thou in faithfulness hast afflicted me. Let, I pray Thee, Thy merciful kindness be for my comfort according to Thy word unto Thy servant."