Faith. Faith is a strong emotion, but it's more than an emotion: it's a commitment, a love affair, a wanting, bonding towards the Lord.
This verse is so great - it tells us that faith the size of a mustard seed can move a tree! Yet, we all know faith can move so much more - when you think Christ is moving 'mountains' in your life, it turns out He's been moving you all along.
Faith means a FULL belief. If you believe you have boundaries, or that there are boundaries in life, it's not faith. I know - it's awesome.
So muster up your mustard seed and see the miracles Christ can do!