John Calvin Commentary Psalms 72:11

"Yea, all kings shall fall down before him; All nations shall serve him." — Psalms 72:11 (ASV)

And all kings shall prostrate themselves before him. This verse contains a clearer statement of the truth that the whole world will be brought into subjection to the authority of Christ.

The kingdom of Judah was unquestionably never more flourishing than under the reign of Solomon. However, even then, only a small number of kings paid tribute to him. The amount they paid was inconsiderable, and furthermore, it was paid on the condition that they should be allowed to live in the enjoyment of liberty under their own laws.

While David then began with his own son and his son's posterity, he rose by the Spirit of prophecy to the spiritual kingdom of Christ. This point is worthy of our special notice, since it teaches us that we have not been called to the hope of everlasting salvation by chance, but because our heavenly Father had already destined to give us to his Son.

From this we also learn that in the Church and flock of Christ there is a place for kings. For David does not here disarm them of their sword or despoil them of their crown to admit them into the Church; rather, he declares that they will come with all the dignity of their station to prostrate themselves at the feet of Christ.