Charles H. Spurgeon on Psalms 21:9

"The time of thine anger." If God be willing to pour out his heavy displeasure upon those that displease him, what can hinder his mighty arm from performing? Creatures indeed may be angry, but oftentimes, like drones without stings, cannot hurt; as cannons charged with powder without shot only make a roaring; like the Pope's Bulls, threaten many, hurt none but those whose conscience is enslaved. Saul may be angry at David, but cannot find him out; but from God's all-piercing eye none can hide himself. Satan may desire to kill Job, Jonah may be angry till death for Nineveh's preservation; yet God puts a bit in both their mouths, who, if he be angry, nothing can be holden out of his reach. Princes, if they take captives, may have them rescued from them again, as Lot was from the King of Sodom; bought with a price, as Joseph of the Ishmaelites. But no power can rescue us from God's anger, no ransom but Christ's blood redeem us. God's will being set afoot, all his attributes follow; if his will say, Be angry, his eye seek out the object of his anger, and finds it; his wisdom tempers the cup, his hand whets the sword, his arm strikes the blow. Thus you see there is a time of God's anger for sin, because he will have it so. —John Cragge.