MSTC(i)
19 Then came the disciples to Jesus secretly, and said, "Why could not we cast him out?"
20 Jesus said unto them, "Because of your unbelief. For I say verily unto you, if ye had faith as a grain of mustard seed, ye should say unto this mountain, remove hence to yonder place, and he should remove: Neither should any thing be impossible for you to do.
21 Howbeit, this kind goeth not out but by prayer and fasting."