Matthew 21:21-22 NIV
Jesus replied, “Truly I tell you, if you have faith and do not doubt, not only can you do what was done to the fig tree, but also you can say to this mountain, ‘Go, throw yourself into the sea,’ and it will be done. If you believe, you will receive whatever you ask for in prayer.”
What does Jesus mean by " this mountain "? It is the same thing you get when you knock and the door is opened, and you find when you seek. Ask and it will be given to you.
If you believe in Jesus, your prayer is heard by the Father. You enter the presence of The Lord and He will give you the desire of your heart.