Some people would say that all of our prayers are answered, because even “no” is an answer.

However, I would say that God answers all prayers in His time, and since we don’t know what that is in every situation, I can conclude that some of our prayers have not yet been answered.

Repeating prayers doesn’t mean you are doubting God. It means you are being persistent. The Bible says that the “fervent” or persistent prayers of righteous people are effective and have great results (James 5:16).