My reading.
1. The Defiance of Man. Verses 1–3
The psalm opens with the "nations raging" and rulers plotting against the Lord and His Anointed. It depicts a world in active rebellion, viewing God’s moral law as "chains" or "shackles" they wish to throw off. It captures the perennial human desire for total autonomy.
2. The Derision of God. Verses 4–6
The perspective shifts abruptly from the noisy earth to the silent heavens. God’s reaction to human insurrection isn't panic—it is laughter. This isn't a cruel laugh, but a "derisive" one that highlights the absurdity of finite creatures challenging the Infinite. God simply speaks His decree: "I have set my King on Zion."
3. The Decree of the Son. Verses 7–9
The focus moves to the King himself. He recounts the Father’s promise: "You are my Son; today I have begotten you." In a New Testament context (Acts 13:33, Hebrews 1:5), this is interpreted as the resurrection and exaltation of Jesus Christ. The Son is promised the nations as His inheritance and the authority to judge those who persist in rebellion.
4. The Call to Wisdom. Verses 10–12
The psalm concludes with a gracious warning. Rulers and judges are urged to be wise: "Serve the Lord with fear" and "Kiss the Son." To "kiss the Son" is an act of fealty and submission. The psalm ends with a beatitude—a promise of blessing for all who take refuge in Him.