It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth:
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Clement Of Alexandria
AD 215
The word which proclaims the kingdom of heaven is sharp and pungent as mustard. It represses bile (anger) and checks inflammation (pride). From this word flows the soul’s true vitality and fitness for eternity. To such increased size did the growth of the word come that the tree which sprang from it (that is the Church of Christ now being established over the whole earth) filled the world, so that the birds of the air (that is, holy angels and lofty souls) dwelt in its branches. Fragments from the Catena of Nicetas, Bishop of Heraclea
That which is, he says, nothing, and which consists of nothing, inasmuch as it is indivisible-(I mean) a point-will become through its own reflective power a certain incomprehensible magnitude. This, he says, is the kingdom of heaven, the grain of mustard seed,
