I prefer Mark's version of the mustard seed story over another story that appears in Matthew and Luke (which get a lot more air time!
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30-31 ... the kingdom of God ... is like a mustard seed, which, when sown upon the soil, though it is smaller than all the seeds that are upon the soil,
32 yet when it is sown, it grows up and becomes larger than all the garden plants and forms large branches; so that the birds of the air can nest under its shade.
In the other mustard story in Matthew and Luke, the mustard seed is referred to merely as something that happens to be small.
Matthew 17:19-20: "if you have faith the size of a mustard seed, you will say to this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you"
Luke 17:5-6 "If you had faith the size of a mustard seed, you could say to this mulberry tree, 'Be uprooted and planted in the sea,' and it would obey you."
In the versions presented in Matthew and Luke, Jesus might as well have said "faith the size of a grain of sand."
But in Mark's version, Jesus was not referring to something with a small amount of faith. He was referring to something small that had a
great amount of faith, and through that faith it performs great actions.