Lord, Increase Our Faith

And the apostles said unto the Lord, Increase our faith. And the Lord said, If you have faith as a grain of mustard seed, you might say unto this sycamine tree, Be you plucked up by the root, and be you planted in the sea; and it should obey you.

Then came the disciples to Jesus apart, and said, Why could not we cast him out? And Jesus said unto them, Because of your unbelief: for verily I say unto you, If you have faith as a grain of mustard seed, you shall say unto this mountain, Remove here to yonder place, and it shall remove, and nothing shall be impossible unto you. Howbeit this kind goes not out but by prayer and fasting. 

Matt. 17:19-21;Luke 17:4-6