Charles H. Spurgeon on Psalms 9:19

Prayers are the believer's weapons of war. When the battle is too hard for us, we call in our great ally, who, as it were, lies in ambush until faith gives the signal by crying out, "Arise, O Lord." Although our cause be all but lost, it shall be soon won again, if the Almighty doth but bestir himself. He will not suffer man to prevail over God, but with swift judgments will confound their gloryings. In the very sight of God the wicked will be punished, and he who is now all tenderness will have no bowels of compassion for them, since they had no tears of repentance while their day of grace endured.