Luke 1:12 (ESV) "...for your prayer has been heard." Literally translates from the Greek "the prayer YOU NO LONGER PRAY has been heard"! The first time I heard that revelation I had to stop the podcast and everything else I was doing and just soak it in. The prayer no longer being prayed was answered... That's not to say we should just quit praying for things! No way! (See Luke 18:1-8, Jesus says quite the opposite) but I'd draw from this to never give up on a prayer - it will not go unanswered.