Jesus told the story of the publican and the pharisee who both went to the Temple to pray. The pharisee said a long extemporaneous prayer. The publican prayed over and over again, "lord have mercy on me." The publican went away justified while the pharisee was not.
Another time as Jesus was passing through a blind person called out over and over again, "Lord Jesus, Son of David, Have mercy on me!!!" The people told him to shut up. However Jesus called him over and gave him his sight.