Christmas and Epiphany is Jesus’ proclamation: “Okay, I’m coming to take over now. Repent and believe the Gospel.” The nations and peoples and kings and rulers have rebelled long enough now; God is setting up His Son as King over His good and kind and gentle and beneficent rule, realized at his first coming, finalized at his second.
The Enemy is pride, and lust for power and control; I want to control my little domain and sphere of influence by myself for myself (“my name be honored, my will be done, my kingdom come”). When a rebellious human believes in Jesus the Holy Spirit gently breaks stubborn self will, but it does come with resistance and a bit of wrenching violence like an iron rod breaking a potter’s vessel. But it is good for you.
“Serve the Lord with fear, rejoice with trembling, and kiss the Son.” In other words, repent and believe the Good News of the good king, worship Jesus, and submit to Christ as Lord. In doing so He conquers the enemies of sin, death and the devil. The end result in the final verse is blessing.