Promise v. covenant

I believe that this idea of promise is fundamental to the Old Testament and that it is even more foundational than the concept of covenant or the question of how God relates to humanity at different periods in redemptive history. The concept of promise places the focus on God, because God has made the promise, and the content of the promise is that God will send his own Son to us.

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(pp. 121-122, Don Fairbairn, Life in the Trinity)