The Enemy Is Esau and God's Power in War Versus Judgment

Yalkut Shimoni on Torah 246:9

Another interpretation: this is Esau, as it is said, "Because the enemy said" (Lamentations, cf. the verse). Rabbi Hanina bar Pappa raised a contradiction: it is written, "the Almighty, we cannot find Him out, great in power" (Job 37:23), and it is written, "Your right hand, O LORD, is glorious in power." There is no difficulty: here it speaks of the time of judgment, there of the time of war.

Themes