Leonard Ravenhill on faith:
Now obviously no faith is required to do the possible;actually only a morsel of this atom-powered stuff is needed to do the impossible,for a piece as large as a mustard seed will do more than we have ever dreamed of. Again and again God asks men to do not what they can,but what they can’t.
Matthew 17:20 And Jesus said unto them,Because of your unbelief:for verily I say unto you,If ye have faith as a grain of mustard seed,ye shall say unto this mountain,Remove hence to yonder place;and it shall remove;and nothing shall be impossible unto you.