Peter (maybe it was Paul!) said a prayer like that. It was for someone who had wronged the Christians. I guess this guy made like he was a Christian and then turned on them.
I think the gist of the prayer was he asked the Lord to bless this man in accordance to what he had done to the Christians.
I ask that, too. It usually keeps me from asking for evil things to be done. If a person is lost and gets saved nothing we say or do will convict him/her of thier actions anymore than the Lord.
If a person's saved, God will always chastise the child. For the child's (person's) sake.
There are times, however, when I sin because I get 'in the flesh.'
Thank you, for the reminder.