Charles H. Spurgeon on Psalms 52:6

The righteous —the object of the tyrant's hatred —shall outlive his enmity, and also shall see, before his own face, the end of the ungodly oppressor. God permits Mordecai to see Haman hanging on the gallows. David had brought to him the tokens of Saul's death on Gilboa. And fear. Holy awe shall sober the mind of the good man; he shall reverently adore the God of providence. And shall laugh at him. If not with righteous joy, yet with solemn contempt. Schemes so far reaching all baffled, plans so deep, so politic, all thwarted. Mephistopheles outwitted, the old serpent taken in his own subtlety. This is a good theme for that deep seated laughter which is more akin to solemnity than merriment.