Mark 11:23 For assuredly, I say to you, whoever says to this mountain, ‘Be removed and be cast into the sea,’ and does not doubt in his heart, but believes that those things he says will be done, he will have whatever he says.
When Christ wanted to show how faith and trust in Him would result in amazing miracles He chose to turn the comparison of an immovable mountain on its head.
When we have faith enough to trust God can do anything, He will be able to deliver on His promise to answer our prayers beyond the normal and beyond the physical possibilities of this earth.
Nothing is impossible with God, but our lack of faith continues to limit our requests being made to Him.