Charles H. Spurgeon on Psalms 110:5

The Lord...shall strike through kings, etc. He really threatens such great heads in an awful manner, that if they will not hear, and cannot obey, they shall be terrified to death. And assuredly he would willingly, by these means, allure them to repentance, and persuade them to turn, and to cease from raging against the Lord. But if they will not, they shall know against whom it is that they go on... This is our consolation which upholds us, and makes our heart joyful and glad against the persecution and rage of the world, that we have such a Lord, who not only delivers us from sin and eternal death, but also protects us, and delivers us in sufferings and temptations, so that we do not sink under them. And though men rage in a most savage manner against Christians, yet neither the gospel nor Christianity shall perish; but their heads shall be destroyed against it. If their persecutions were to go on unceasingly Christianity could not remain, wherefore he gives them a time, and says he will connive at them for a while, but not longer than till the hour comes which he here calls the "day of his wrath" And if they will not now cease in the name of God, they must then cease in the name of the devil. Martin Luther.