He replied, "Because you have so little faith. Truly I tell you, if you have faith as small as a mustard seed, you can say to this mountain, 'Move from here to there,' and it will move. Nothing will be impossible for you." (NASB, See other translations)
Jesus says little faith in disciples is the reason they couldn't heal the epileptic man, then in the same passage Jesus says one only needs faith as small as a mustard seed to do great things. What can we see from translation used for 'little faith' that's used negatively and 'small faith' that's used positively?
I struggle with faith being seen as some mystical force that can be increased to avoid unbelief, yet it can simultaneously be powerful while small. Can faith be translated as 'trust' at times?