THEOSISTheodoret of Cyrus
My eternal one. Even though you have disregarded the agreements made with me, this will not lead me to abandon you completely; rather, having granted you wisdom through discipline and shown you kindness, I will remember the promises made to you in your youth. I will establish My covenant as a perpetual commitment; it is not a covenant of the law, but one of grace; it does not stem from Moses, but is rooted in the ministry of the apostles. The former was temporary, whereas this one is everlasting.
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This assurance comes through the words of the prophet Jeremiah, who declares, I will establish a new covenant with the house of Israel and the house of Judah, not like the covenant I made with their ancestors when I led them out of Egypt; for they did not remain faithful to My covenant, and I turned away from them (Jeremiah 31:31-32). Instead, I will create a new covenant: I will place My laws in their minds and write them on their hearts (Jeremiah 31:33). The same promise of covenant is affirmed here.