Charles H. Spurgeon on Psalms 109:7

When he shall be judged, let him be condemned. He judged and condemned others in the vilest manner, he suffered not the innocent to escape; and it would be a great shame if in his time of trial, being really guilty, he should be allowed to go free. Who would wish Judge Jeffries to be acquitted if he were tried for perverting justice? Who would desire Nero or Caligula to be cleared if set at the bar for cruelty? When Shylock goes into court, who wishes him to win his suit? And let his prayer become sin. It is sin already, let it be so treated. To the injured it must seem terrible that the black hearted villain should nevertheless pretend to pray, and very naturally do they beg that he may not be heard, but that his pleadings may be regarded as an addition to his guilt. He has devoured the widow's house, and yet he prays. He has put Naboth to death by false accusation and taken possession of his vineyard, and then he presents prayers to the Almighty. He has given up villages to slaughter, and his hands are red with the blood of babes and maidens, and then he pays his vows unto Allah! He must surely be accursed himself who does not wish that such abominable prayers may be loathed of heaven and written down as new sins. He who makes it a sin for others to pray will find his own praying become sin. When he at last sees his need of mercy, mercy herself shall resent his appeal as an insult. "Because that he remembered not to show mercy", he shall himself be forgotten by the God of grace, and his bitter cries for deliverance shall be regarded as mockeries of heaven.