Articles of agreement among men are usually sealed, that the covenants may be the more solemn, and the performances of the covenants the more sure, to mutual satisfaction. God therefore, being willing more abundantly to show to the heirs of promise the immutability of his councils, has confirmed his covenant by a seal (Heb 6:17), which makes the foundations we build on stand sure, Ti2 2:19. The seal of this covenant of nature was natural enough; it was the rainbow, which, it is likely, was seen in the clouds before, when second causes concurred, but was never a seal of the covenant till now that it was made so by a divine institution. Now, concerning this seal of the covenant, observe, 1. This seal is affixed with repeated assurances of the truth of that promise of which it was designed to be the ratification: I do set my bow in the cloud (Gen 9:23); it shall be seen in the cloud (Gen 9:14), that the eye may affect the heart and confirm the faith; and it shall be the token of the covenant (Gen 9:12, Gen 9:13), and I will remember my covenant, that the waters shall no more become a flood, Gen 9:15. Nay, as if the Eternal Mind needed a memorandum, I will look upon it, that I may remember the everlasting covenant, Gen 9:16. Thus here is line upon line, that we might have sure and strong consolation who have laid hold of this hope. 2. The rainbow appears when the clouds are most disposed to wet, and returns after the rain; when we have most reason to fear the rain prevailing, then God shows this seal of the promise that it shall not prevail. Thus God obviates our fears with such encouragements as are both suitable and seasonable. 3. The thicker the cloud the brighter the bow in the cloud. Thus, as threatening afflictions abound, encouraging consolations much more abound, Co2 1:5. 4. The rainbow appears when one part of the sky is clear, which intimates mercy remembered in the midst of wrath; and the clouds are hemmed as it were with the rainbow, that they may not overspread the heavens, for the bow is coloured rain or the edges of a cloud gilded. 5. The rainbow is the reflection of the beams of the sun, which intimates that all the glory and significancy of the seals of the covenant are derived from Christ the Sun of righteousness, who is also described with a rainbow about his throne (Rev 4:3), and a rainbow upon his head (Rev 10:1), which intimates, not only his majesty, but his mediatorship. 6. The rainbow has fiery colours in it, to signify that though God will not again drown the world, yet, when the mystery of God shall be finished, the world shall be consumed by fire. 7. A bow bespeaks terror, but this bow has neither string nor arrow, as the bow ordained against the persecutors has (Psa 7:12, Psa 7:13), and a bow alone will do little execution. It is a bow, but it is directed upwards, not towards the earth; for the seals of the covenant were intended to comfort, not to terrify. 8. As God looks upon the bow, that he may remember the covenant, so should we, that we also may be ever mindful of the covenant, with faith and thankfulness.

I do set my bow in the cloud - On the origin and nature of the rainbow there had been a great variety of conjectures, till Anthony de Dominis, bishop of Spalatro, in a treatise of his published by Bartholus in 1611, partly suggested the true cause of this phenomenon, which was afterwards fully explained and demonstrated by Sir Isaac Newton. To enter into this subject here in detail would be improper; and therefore the less informed reader must have recourse to treatises on Optics for its full explanation. To readers in general it may be sufficient to say that the rainbow is a mere natural effect of a natural cause:

1.It is never seen but in showery weather.

2.Nor then unless the sun shines.

3.It never appears in any part of the heavens but in that opposite to the sun.

4.It never appears greater than a semicircle, but often much less.

5.It is always double, there being what is called the superior and inferior, or primary and secondary rainbow.

6.These bows exhibit the seven prismatic colors, red, orange, yellow, green, blue, indigo, and violet.

7.The whole of this phenomenon depends on the rays of the sun falling on spherical drops of water, and being in their passage through them, refracted and reflected.

The formation of the primary and secondary rainbow depends on the two following propositions;

1.When the sun shines on the drops of rain as they are falling, the rays that come from those drops to the eye of the spectator, after One reflection and Two refractions, produce the primary rainbow.

2.When the sun shines on the drops of rain as they are falling, the rays that come from those drops to the eye of the spectator after Two reflections and Two refractions, produce the secondary rainbow.

The illustration of these propositions must be sought in treatises on Optics, assisted by plates. From the well-known cause of this phenomenon It cannot be rationally supposed that there was no rainbow in the heavens before the time mentioned in the text, for as the rainbow is the natural effect of the sun's rays falling on drops of water, and of their being refracted and reflected by them, it must have appeared at different times from the creation of the sun and the atmosphere. Nor does the text intimate that the bow was now created for a sign to Noah and his posterity; but that what was formerly created, or rather that which was the necessary effect, in certain cases, of the creation of the sun and atmosphere, should now be considered by them as an unfailing token of their continual preservation from the waters of a deluge; therefore the text speaks of what had already been done, and not of what was now done, קשתי נתתי kashti nathatti, "My bow I have given, or put in the cloud;" as if he said: As surely as the rainbow is a necessary effect of sunshine in rain, and must continue such as long as the sun and atmosphere endure, so surely shall this earth be preserved from destruction by water; and its preservation shall be as necessary an effect of my promise as the rainbow is of the shining of the sun during a shower of rain.

And it shall come to pass, when I bring a cloud over the earth,.... Or "cloud a cloud" (u), cause the clouds to gather thick in the heavens, and to hang over the earth ready to pour down great quantities of water; by reason of which the inhabitants might dread another flood coming upon them: wherefore, in order to dissipate such fears, it shall be so ordered:

that the bow shall be seen in the cloud; after it has pretty much discharged itself; for the rainbow is always in a thin, not a thick cloud; after the heavy showers are fallen from the thick clouds, and a small thin one remains, then the rainbow is seen in it; not always, but very frequently, and when the sun and clouds are in a proper position: and this is often so ordered, to put men in mind of this covenant, and to divest them of, or prevent their fears of the world being drowned by a flood; for when they see this, it is a sure sign the rain is going off, since the cloud is thinned, or otherwise the rainbow could not appear: and a most glorious and beautiful sight it is, having such a variety of colours in it, and in such a position and form. Some think that it serves both to put in mind of the destruction of the old world by water, through its watery colours, and of the present world by fire, through its fiery ones. Others make the three predominant colours to denote the three dispensations before the law, under the law, and under the Gospel: rather they may signify the various providences of God, which all work together for the good of his people; however, whenever this bow is seen, it puts in mind of the covenant of preservation made with all the creatures, and the firmness, stability, and duration of it; and is by some considered as an emblem of the covenant of grace, from Isa 54:9 which is of God's making, as this bow is; is a reverberation of Christ the sun of righteousness, the sum and substance of the covenant; consists of various blessings and promises of grace; is expressive of mercy and peace, and is a security from everlasting destruction: or rather it may be thought to be an emblem of Christ himself, who was seen by John clothed with a cloud, and a rainbow on his head, Rev 10:1 this being a wonderful thing, as Christ is wonderful in his person, office, and grace; and as it has in it a variety of beautiful colours, it may represent Christ, who is full of grace and truth, and fairer than the children of men; and may be considered as a symbol of peace and reconciliation by him, whom God looks unto, and remembers the covenant of his grace he has made with him and his chosen ones in him; and who is the rainbow round about the throne of God, and the way of access unto it; Rev 4:3 the Jews have a saying,"till ye see the bow in its luminous colours, do not look for the feet of the Messiah, or his coming (w).''

(u) "cum obnubilavero nubem", Pagninus, Montanus, Vatablus, Schmidt. (w) Tikkune Zohar, correct. 18. fol. 32. 2. correct. 37. fol. 81. 1.

RAINBOW. (Gen. 9:8-29)

I do set my bow in the cloud--set, that is, constitute or appoint. This common and familiar phenomenon being made the pledge of peace, its appearance when showers began to fall would be welcomed with the liveliest feelings of joy.