There may be someone you know for whom you are praying. You pray that they would repent and believe in Jesus. You pray that they would come to faith. To that I say, keep praying! Look at Saul. He agreed completely with the killing of Stephen. He is no lover of Jesus. He is determined to bring Jesus' followers to jail. He will squash this nascent band of brothers and sisters in Christ.
Or so he thinks. It won't be long that his life will dramatically change. He will be converted. So keep praying for that wayward child, that troublesome coworker, that critical neighbor. And watch. It may take a while, and things might look very bad. But God hears our prayers. And the bigger they are... Well, you know how that saying ends!