Read 2 Kings 14 today.

This chapter includes the story of Amaziah, king of Judah (the southern tribes). The significant event was the war Amaziah provoked with Israel (the northern tribes). This war led to the defeat of Judah and the destruction of a significant part of the wall around Jerusalem. Destroying that part of the wall would have left Jerusalem defenseless (verse 13).
It seems to be a common trait among leaders to become puffed up after successes. We often run ahead of what God might have us do as we seek to build a legacy for ourselves. May we, as we lead (and everyone is leading someone), seek no glory or honor for ourselves. May we seek to give all glory to God.
2 Kings 14:5-10 NLT
When Amaziah was well established as king, he executed the officials who had assassinated his father. [6] However, he did not kill the children of the assassins, for he obeyed the command of the LORD as written by Moses in the Book of the Law: “Parents must not be put to death for the sins of their children, nor children for the sins of their parents. Those deserving to die must be put to death for their own crimes.”
[7] Amaziah also killed 10,000 Edomites in the Valley of Salt. He also conquered Sela and changed its name to Joktheel, as it is called to this day. [8] One day Amaziah sent messengers with this challenge to Israel’s king Jehoash, the son of Jehoahaz and grandson of Jehu: “Come and meet me in battle!” [9] But King Jehoash of Israel replied to King Amaziah of Judah with this story: “Out in the Lebanon mountains, a thistle sent a message to a mighty cedar tree: ‘Give your daughter in marriage to my son.’ But just then a wild animal of Lebanon came by and stepped on the thistle, crushing it!
[10] “You have indeed defeated Edom, and you are proud of it. But be content with your victory and stay at home! Why stir up trouble that will only bring disaster on you and the people of Judah?”