Charles H. Spurgeon on Psalms 55:19

God shall hear, and afflict them. They make a noise as well as I, and God will hear them. The voice of slander, malice, and pride, is not alone heard by those whom it grieves, it reaches to heaven, it penetrates the divine ear, it demands vengeance, and shall have it. God hears and delivers his people, he hears and destroys the wicked. Their cruel jests, their base falsehoods, their cowardly insults, their daring blasphemies are heard, and shall be repaid to them by the eternal judge. Even he that abideth of old. He sits in eternity, enthroned judge for evermore; all the prayers of saints and profanities of sinners are before his judgment seat, and he will see that justice is done. Selah. The singer pauses, overwhelmed with awe in the presence of the everlasting God. Because they have no changes, therefore they fear not God. His own reverential feeling causes him to remember the daring godlessness of the wicked; he feels that his trials have driven him to his God, and he declares that their uninterrupted prosperity was the cause of their living in such neglect of the Most High. It is a very manifest fact that long continued ease and pleasure are sure to produce the worst influences upon graceless men: though troubles do not convert them, yet the absence of them makes their corrupt nature more readily develop itself. Stagnant water becomes putrid. Summer heat breeds noxious insects. He who is without trouble is often without God. It is a forcible proof of human depravity that man turns the mercy of God into nutriment for sin: the Lord save us from this.