Selections from the Unpublished Writings of Jonathan Edwards, of America

The following quote is from Jonathan Edward's annotations on passages of Scripture, which was published in Selections from the Unpublished Writings of Jonathan Edwards, of America (pages 84-85) (and can be read here thanks to Google Book Search):

53. Exod. xx. 3-7.] The three first commandments. The first commandment respects the object of worship; and especially forbids those things in worship that are against God the Father. The second commandment respects the means of worship; and especially forbids those things in worship that are against God the Son, that is should not be by other lords and mediators instead of Christ, the Lord our God, who is, as it were, the husband of His people, and is a jealous God, a jealous husband, that will not bear spiritual adultery. This commandment forbids our making use of other images in our worshipping God besides Christ, who is "the image of the invisble God, the brightness of His glory, and the express image of His person," by which image alone God makes known Himself and sets forth Himself, and shews His glory as the fit object of our worship; for we behold "the glory of God in the face of Jesus Christ." The Heathen had images that they might have something present with them as representatives of the Deity that was absent; but Christ only is our Immanuel or "God with us." The third commandment forbids those things in worship that are especially against the Holy Ghost, even the unholy manner of worship. We ought, when we come to God to worship Him, to come by the Son, that we may come by right means; and we ought to come by the Holy Spirit, that we may worship with a right spirit and in a holy manner. These sins against the Holy Spirit are represented as peculiarly exposing persons to Divine vengeance without forgiveness, agreeable to what we are taught in the New Testament.
54. Exod. xx 4-"Any likeness of any thing that is in heaven above"]-i.e., the likeness of sun, moon, or stars, or any bird; [or "that is in the earth beneath"]-i.e., of any man, woman, beast, or creeping thing; [or "that is in the water under the earth"]-i.e. any fish. This interpretation is evident from Deut. iv 16-18. That the second commandment has respect to worshipping the true God by images see Deut. v. 7, 8.

Also,

73. Deut. v. 7, 8.] That this first commandment has respect to worshipping other gods ; but the second has respect to worshipping the true God by images, is confirmed by chap. iv. 16-18. The people were in danger of representing God by some image of bird or beast, or some other animal, because the Egyptians, that were a neighbouring nation, and a people among whom they had dwelt, represented all invisible things by images or hieroglyphics.