There are times when we pray about something maybe once or twice, even three times, and if we don’t receive an answer, then we give up.
But Jesus taught His disciples “that they should always pray and not give up” - Luke 18:1
It may be that you have asked God for something in your life that He wants to do. Just because it has not happened yet does not mean that it will never happen. God’s delays are not necessarily His denials. Clearly, there are some prayers the devil will oppose more than others. For example, when you pray for someone’s salvation, you need to know that it is a spiritual battle. The victory will come.
Maybe you have been praying about something and there has not been an answer, only disappointments. But disappointment can be His appointment. So don’t give up!