Charles H. Spurgeon on Psalms 53:5

There were they in great fear, where no fear was. Behold how fearful a hell a wounded conscience is! For why is Cain afraid to be killed, seeing there is none living to perform it, but his father and mother, and perhaps some women children, which the Scripture nameth not? It is God's just judgment, that they that will not fear the Lord who is only to be feared, should stand in fear of them who are justly no cause of fear. He that lately feared not to kill his brother, is now made a terror to himself. Hereby also we may consider what is the repentance of the wicked; they see perhaps the fault together with the punishment, but they admit the fault and lament the punishment. Nicholas Gibbens, 1602.