Psalms 103:17-19

Verse 17

The mercy of the Lord is from everlasting to everlasting - חסד chesed signifies more particularly the exuberant goodness of God. This is an attribute of his nature, and must be from everlasting to everlasting; and hence, his righteousness (צדקת tsidketh) - his merciful mode of justifying the ungodly, is extended from one generation to another.

Unto children's children - It is still in force, and the doctrine of reconciliation through Christ shall continue to be preached till the conclusion of time.
Verse 18

To such as keep his convenant - The spirit of which was, I will be your God; We will be thy People. From the covenant came the commandments, and their obligation to remember and do them; and on such keepers of the covenant, and doers of the commandments, God promises to pour out his mercy through all generations.
Verse 19

The Lord hath prepared his throne in the heavens - There he is Sovereign, but his dominion extends equally over all the earth; for his kingdom - regal government, influence, and sway, ruleth over all.
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