Charles H. Spurgeon on Psalms 74:4

Thine enemies roar in the midst of thy congregations. Where thy people sang like angels, these barbarians roar like beasts. When thy saints come together for worship, these cruel men attack them with all the fury of lions. They have no respect for the most solemn gatherings, but intrude themselves and their blasphemies into our most hallowed meetings. How often in times of persecution or prevalent heresy has the church learned the meaning of such language. May the Lord spare us such misery. When hypocrites abound in the church, and pollute her worship, the case is parallel to that before us; Lord save us from so severe a trial. They set up their ensigns for signs. Idolatrous emblems used in war were set up over God's altar, as an insulting token of victory, and of contempt for the vanquished and their God. Papists, Arians, and the modern school of Neologians, have, in their day, set up their ensigns for signs. Superstition, unbelief, and carnal wisdom have endeavoured to usurp the place of Christ crucified, to the grief of the church of God. The enemies without do us small damage, but those within the church cause her serious harm; by supplanting the truth and placing error in its stead, they deceive the people, and lead multitudes to destruction. As a Jew felt a holy horror when he saw an idolatrous emblem set up in the holy place, even so do we when in a Protestant church we see the fooleries of Rome, and when from pulpits, once occupied by men of God, we hear philosophy and vain deceit.