I am still wondering if anyone actually moved a physical mountain yet, although I'm 99% sure it was more of a metaphor about overcoming the spiritual or mental mountain in one's own life...having the amount of faith of a mustard seed would allow one to "move" those mountains to enhance and have a clearer view...Perhaps also another way to think of this could be by just having the smallest amount of faith will enable a person to put actions forward and big results can ensue.