Charles H. Spurgeon on Psalms 53:4

Have the workers of iniquity no knowledge? Conscience is a means to curb and restrain, control and rebuke corrupt nature, and the swelling forms of it. It is not there as a native inhabitant, but as a garrison planted in a rebellious town by the great Governor of the world, to keep the rebellion of the inhabitants within compass, who else would break forth into present confusion. David, speaking of the corruption of man by nature, after this question, Whether there be not some knowledge to discover their evil doings to them? yes, says he, Have they no knowledge, who eat up my people as bread Yes; and therefore (Ps 53:5) They are often in fear, God having placed this there to overcome them with fear; and by that to restrain them from many outrages against God's people, whom in their desires, and sometimes practice, they eat up as bread Therefore this knowledge is put in as a bridle to corrupt nature, as a hook was put into Sennacherib's nostrils (Isa 37:29) to rule and tame men, and overcome them with fear. If they had no knowledge they would eat up one another, and the church, as bread; but there is their fear, says he, that is, thence it comes to pass they are kept in awe Thomas Goodwin, 1600-1679.