John Wesley on Jeremiah 31:31

Behold - And not only with the Jews, but all those who should be ingrafted into that Olive. It is not called the new covenant, because it was as to the substance new, for it was made with Abraham, Gen 17:7, and with the Jews, Deut 26:17,18, but because it was revealed after a new manner, more fully and particularly, plainly and clearly. Nor was the ceremonial law any part of it, as it was to the Jews, a strict observance of that. It was likewise new in regard of the efficacy of the spirit attending it, in a much fuller and larger manner.