"Through these three emphases [John] Murray effectively achieved a recasting of covenant theology . . . Murray flattened much of the complexity and depth of covenantal thought. The influence of this flattening would be long-lived.
Perhaps the most important influence that Murray exerted was in shaping the reactionary covenant theology of Meredith Kline (1922-2007). Before Kline's doctrine can be understood, however, one must grasp the work of George E. Mendenhall (1916-2016) . . .
Mendenhall's work on biblical covenants . . . exerted a tremendous influence over covenant theology in the latter part of the twentieth century, asserting that influence most strongly through the covenantal thought of Meredith Kline. Kline had been first a student and then a colleague of John Murray, and in his articulation of covenant theology, Kline made very clear that reaction against Murray's perceived errors was a guiding influence over his own covenantal thought. On some points, this rejection of Murray is clear. For example, while Murray rejected the doctrine of the covenant of works, Kline defended it in great detail. More important than this difference with Murray, however, was Kline's sustained reaction against Murray's suggestion that the divine covenants, were always and only bestowals of grace and favor. In fact, Kline's attempt to dismantle this definition of covenant provided the substructure and impetus for much of his work. To achieve this end, Kline relied heavily on the work of George Mendenhall, Moshe Weinfeld, Delbert Hillers, and others. Drawing on the work of these scholars, Kline focused on the distinction within Hittite legal documents between suzerainty treaties and land grants, sometimes known as royal grant treaties . . .
In Kline's estimation, ancient Near Easter legal forms had had a shaping influence on the Scriptures, but that influence was shared between suzerainty treaties and royal grant treaties, with portions of the Scripture being shaped by the former and other portions of the Scriptures being shaped by the latter. In order, then, to understand and interpret what God was doing in the Pentateuch properly, one must distinguish between these two influences. To facilitate that necessary distinction, Kline labeled those biblical covenants that had been influenced by suzerainty treaties "law covenants," and those biblical covenants that had been influenced by royal grant treaties, he termed "promise covenants."