'Little Faith' in the Bible

But if God gives such clothing to the grass of the field, which is here today and tomorrow is put into the oven, will he not much more give you clothing, O you of little faith?

And he said to them, Why are you full of fear, O you of little faith? Then he got up and gave orders to the winds and the sea; and there was a great calm.

And straight away Jesus put out his hand and took a grip of him, and said to him, O man of little faith, why were you in doubt?

And Jesus, seeing it, said, O you of little faith, why are you reasoning among yourselves, because you have no bread?

And he says to them, Because of your little faith: for truly I say to you, If you have faith as a grain of mustard seed, you will say to this mountain, Be moved from this place to that; and it will be moved; and nothing will be impossible to you.