Covenant of Kingship
Queen Elizabeth was installed as the monarch in England six weeks before I was born. She has literally been the Queen for the entire lives of something like 90% of all citizens of Great Britain! She is much respected and has reigned with honor and grace. But the Queen of England does not actually rule there. She is a figurehead and a great influence. However real government decisions are made by the Prime Minister and the Parliament, not the Queen (or King).
After the period of the Judges, when the Scriptures say "everyone did what was right in their own eyes," (Judges 17:6 KJV) Israel lobbied the last Judge, Samuel (and God) for a King. God gave them what they wanted, even though His intention was always that He would be their King. Saul, the first King of Israel, started well, but quickly disobeyed and dishonored the Living God. When he died, David became the King of Israel.
King David was the greatest king in Israel's history. According to the Bible, David was "a man after God's own heart." God covenanted with David that one of his descendants would rule forever on his throne. That forever-Ruler-in-the-line-of-David is Jesus Christ!
Jesus' forever Kingdom will make Queen Elizabeth's 68-year (and counting) reign seem like a momentary blip! And Jesus will not be a figurehead King. When He returns and establishes His forever Kingdom, the Apostle Paul says, "...at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue acknowledge that Jesus Christ is Lord, to the glory of God the Father." (Philippians 2:10-11 NIV)
The earliest creed of the first century Church was short, but powerful. "Jesus is Lord." Caesar called himself Lord. The Church declared that Jesus is Lord, and not Caesar. Jesus is and always will be King of kings and Lord of lords. That raises two important questions in my mind.
When will Jesus be King of kings and Lord of lords? Will His Lordship be real, or will Jesus be a figurehead King?
As to when Jesus will fully become King of kings and Lord of lords, that will be finally fulfilled when He returns, defeats evil, ends human history, and ushers in heaven. It will be fulfilled for individual people, however, at one of two points: either when we receive Him as Savior and choose to make Him Lord of our lives, or when we die, meet Him face-to-face, and have to admit He is Lord.
I asked Jesus to come into my life when I was 15 years old. I have been seeking to serve Him as Lord of my life ever since. Jesus is already King of kings and Lord of lords to me, because by faith, I seek to honor and obey Him in all I do. Am I 100% faithful in that? Nope. I wish I were. I strive to be. But I still give in to the selfishness of my fallen nature and disobey Him sometimes. Overall, though, Jesus is Lord of me!
As to whether Jesus is a figurehead King in my life, that depends on the orientation of my heart and the actions of my life day-to-day. As long as I am saying, "Yes, Lord," to Him, then He is the real Lord of my life, and not a figurehead King. When I go my own way and insist on my own will, then I make Jesus a figurehead Lord in those moments and decisions.
Nothing I can do can stop Jesus from being King of kings and Lord of lords. Jesus is Lord, whether I obey Him or not, in the cosmic sense. Jesus is Lord of me here and now as long as I am living in union with Him and not in rebellion against Him. Even then, He does not stop being Lord of my life because of my disobedience. It's just that the completeness of His reign in my life fully exists as I honor and serve Him.
And that is what I am striving to do, as long as I live. By His grace and in the power of His Spirit, I seek to ever increase in my obedience to my forever King! So help me, God.