"Notice that Christ didn't generalize His illustration with "any" mountain. He specifically said "this" mountain. To what mountain did He refer? If you'll check the context, Jesus and three of His disciples had just come down from the mountain where He was transfigured before them. When Jesus specifically said, "You can say to this mountain" (author's emphasis), I believe He pointed to the same mountain. So there you have it. Beloved, if you pray that God will move a mountain and He doesn't, or you have the faith to tell a mountain to move and it won't, assume Christ wants you to climb it instead and see Him transfigured. Either way the mountain is under your feet. "The one who trusts in him will never be put to shame" (Rom. 9:33)."