The Mustard Seed Dilemma—
The general Christian response to this claim is to say that Jesus was speaking at the level of the Jews of his time, for whom in their general knowledge, the mustard seed is the smallest.
But...if Jesus is God and all knowing, then he must've had the knowledge and ability to articulate his point without appealing to the ignorance of the common people as the basis for God's spoken word (the presence of this "proverb" has created an error in the modern day).
Whether proverbial or otherwise, whatever language device one wants to appeal to, couldn't Jesus articulate his point without entailing a lie (that the seed is the smallest in all the earth)? By omitting the word "all", his point could've been reasonably accurate.
By including the word "all/ παντων" he has created a contradiction and appealed to a non-factual, thus either he lacked the knowledge about the seed (ignorant), was poor in articulation (an unforced error), or he believed in what he said (deluded).
The Christian response is just not good on this point.
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