John 14:12

I assure you and most solemnly say to you, anyone who believes in Me (as Savior) will also do the things that I do; and he will do even greater things than these (in extent and outreach) because I am going to the Father.

If mountains are not moving when we pray, we may need to meditate on this scripture until we believe in what Jesus says. When we keep the Word before our eyes, our faith will build, and we will be convinced. If we are not convinced, our prayers go unanswered. It comes down to living a defeated Christian life without faith or a powerful force for God.