Work, work your thoughts and therein see a king at war who holds those guilty that defy him. Behold him facing a besieged town, shouting out all the terrors that await those who persist in defiance, yet offering mercy if only they will yield to his authority. Note his relief when one chooses mercy, his gentleness with those who trust him and his swift vengeance on those who persist in rebellion.
I borrow this scene from my favorite Shakespeare play, Henry V (Act 3, prologue, Scene 2). But it’s also a Biblical image. We sometimes lose sight in the modern world that the KJV phrase “Lord of hosts” literally means “Yahweh of Armies.” One of the most often used titles of God is about Him personally going forth with a host of armies organized for war.
This is a comforting image when God is fighting against our enemies. But sometimes, “Yahweh’s anger burns against his people,” particularly when “they have rejected the law of Yahweh of Armies and despised the Holy One of Israel” (Is. 5:24-25). Even when that happens, though, God deeply desires to show mercy. His justice demands punishment for sin (Heb. 10:30-31), but His mercy offers a path to forgiveness and salvation (1 Pet. 2:24-25).
It’s common in modern churches to say that God was vengeful and frightening in the Old Testament but is gentle and loving in the New. Such a disconnect is not supported by scripture. Both the Father and the Word (who we now know as Jesus) have been active throughout history. They’re unchanging. In order to have a fuller, more accurate vision of who God is and what He is doing, we need to acknowledge that He is both wrathful justice and gentle mercies.

God’s Desire to Forgive
After the death of righteous Josiah, king of Judah, his son Jehohaz reigned for just 3 months before an Egyptian king dethroned him and set up his brother Jehoiakim in his place. This new king “did that which was evil in Yahweh his God’s sight” (2 Chr. 35:25-36:8). At this time, God was actively working through the prophet Jeremiah, and He sent him with a message.
In the fourth year of Jehoiakim the son of Josiah, king of Judah, this word came to Jeremiah from Yahweh, saying, “Take a scroll of a book, and write in it all the words that I have spoken to you against Israel, and against Judah, and against all the nations, from the day I spoke to you, from the days of Josiah, even to this day. It may be that the house of Judah will hear all the evil which I intend to do to them; that they may each return from his evil way; that I may forgive their iniquity and their sin.” (Jer. 36:1-3, all verses quoted from WEB translation unless otherwise noted)
Jeremiah’s prophecies contain warnings, corrections, lessons, and promises. From God’s words here in the passage I just quoted, it seems one of His main goals in sharing all those warnings was to save people from the consequences of their own disobedience.