John Calvin Commentary Psalms 45:5

"Thine arrows are sharp; The peoples fall under thee; [They are] in the heart of the king`s enemies." — Psalms 45:5 (ASV)

Thy arrows are sharp, etc. Here the Psalmist again refers to warlike power, when he says that the king's arrows shall be sharp, so that they shall pierce the hearts of his enemies; by which the Psalmist intimates that the king has weapons in his hand with which to strike, even at a distance, all his enemies, whoever they may be, who resist his authority. In the same sense, he also says that the people shall fall under him; as if to say, whoever attempts to shake the stability of his kingdom shall miserably perish, for the king has sufficient power in his hand to break the stubbornness of all such persons.