Mountain Moving Faith
Mountain moving faith is trusting and beleiving in God enough to know that there is nothing He cannot do.
When life hits you so hard and you just don’t know what to do, what do you do???
The disciples should have been able to deal with the case: see 10:1, 8. Their failure illustrates the too-frequent combination of a divinely-given authority with a lack of the faith needed to exercise it.
Here again, as Jesus’ following words show, it points not even to a faith which is small but real, but rather to faithlessness. For even the smallest faith (see on 13:31 for the proverbial significance of mustard seed) can move mountains (again a proverbial expression, for the most improbable occurrence; see Isa. 54:10; 1 Cor. 13:2; cf. Baba Bathra 3b). A similar promise of the unlimited possibilities for those who have faith will occur at 21:21. It is a striking illustration of the fact that faith is, for Jesus, not a matter of intellectual assent, but of a practical reliance on a living God. It is important to observe here that it is not the ‘amount’ of faith which brings the impossible within reach, but the power of God, which is available to even the ‘smallest’ faith