Just an observation -- reformed theology dealt comfortably and consistently with the imprecations in the Psalms long before "intrusion ethics" were invented.
Interestingly, the reason Kline saw intrusion ethics as capable of highlighting the continuity of the Covenant of Redemption is because he shared with those who came before him a vision of the glory of God as the chief end of God’s covenantal work. So, though intrusion ethics highlight the differences between the historical covenants, they also point us toward the glorious
telos that they all share.
Geerhardus Vos, for example, touched on this subject—with Psalms in mind like the imprecatory Psalms Samuel mentioned above—in his article the “Eschatology of the Psalter” (pp. 338-340).
“No doubt the Psalter contains much of what is most humanly human in all religious occupation with God: the need and desire and prayer for help in distress. In their extremity of danger and affliction the Psalmists sustain and reassure themselves by the thought of the great deliverance which the end must bring. . . .
"Ploughers might plough upon Israel's back and make long their furrows, the waters might overwhelm them, it could not extinguish the conviction, that the future and the end belonged to the chosen of Jehovah. Specifically the thirst for justice over against enemy and avenger quenched itself in anticipation at this deep fountain of judgment to be opened up at the last. But in the midst of all this soteric motivation the higher point of view of the subserviency of Israel’s salvation to the glory of God is never lost sight of. When the Psalmists make eschatology the anchor of salvation, this is not done in a self-centered spirit. . . .
“Where the prayer assumes the form of a desire for vindication and deliverance through judgment and destruction of the enemy, it might seem as if the center were shifted from God to man. Still on closer examination this appears not to be so. When the praying subject is Israel and the opposing party the hostile pagan world, the conflict between these two, of course, coincides with that between Jehovah and the world, between light and darkness. . . .”
For those who want to read more, Vos’s article is hidden in the back of
The Pauline Eschatology (Phillipsburg: P&R, 1979).Those who have read Kline's article will notice other striking similarities between his article and Vos's.
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And note Calvin's comment on Psalm 109:15:
"Some may inquire how it comes to pass, that the prophet, in desiring that their sin
may be continually before God's eyes, does not likewise add, let their name be blotted out from heaven, but merely wishes them
to be cut off, and to perish in the world? My reply is, that he spoke agreeably to the custom of the age in which he lived, when the nature of spiritual punishments was not so well understood as in our times, because the period had not yet arrived, when the revelation of God's will was to be full and complete. Besides, it is the design of David, that the vengeance of God may be so manifest, that the whole world may acquiesce in his equity as a judge."
Of course, Reformed theologians have dealt with the imprecations in the Psalms before Kline articulated the category of intrusion ethics; he didn't just invent this.