Good quote from Bunyan in his work “All Loves Excelling” on the mediatorial dominion of Jesus Christ:
He has obtained to be made of God the chief and high Lord of heaven and earth for us…’All things’ saith he ‘are delivered unto me of my Father, and all power in heaven and earth is given unto me’, and all this because He died…wherefore God hath highly exalted him and given him a name above every name, that at the name of Jesus every knee should bow, of things in heaven, of things in earth, or things under the earth, and every tongue confess that Jesus Christ is Lord to the glory of God the Father (Philippians 2).
And all this is, as was said afore, for our sakes. He has given him to be head over all things to the Church (Ephesians 1:22). Wherefore, whoever is set up on earth, they are set up by our Lord. ‘By me,’ saith he, ‘kings reign and princes decree justice, by me princes rule and nobles, even all the judges of the earth’ (Proverbs 8:15-16). Nor are they, when set up, left to do, thought they should desire it, their own will and pleasure. The ‘Metheg-amma’, the bridle, is in his own hand, and he giveth reigns or check even as it pleaseth him (2 Samuel 8:1). He has this power for the well-being of his people. Nor are the fallen angels exempted from being put under his rebuke. He is the only potentate (1 Tim. 6:15), and in his times will show it. Peter tells us he is gone into heaven and is on the right hand of God, angels and authorities and powers being made subject unto Him (1 Peter 3:22). This power, as I said, he has received for the sake of his Church on earth, and for her conduct and well-being among the sons of men. Hence, as he is called the king of nations in general (Jeremiah 10:7), so the kings of saints in special (Revelation 15:3). And as he is said to be head over all things in general, so too his Church in special.