Did Jesus Lie When He Said the Mustard Seed was the Smallest of All Seeds?

Or does this prove that He is not omniscient and thus not God?

Critics use Matthew 13:31–32 to try to argue that Jesus either lied or isn't all-knowing and thus not God. Here is the passage.

31 He put another parable before them, saying, “The kingdom of heaven is like a grain of mustard seed that a man took and sowed in his field. 32 It is the smallest of all seeds, but when it has grown it is larger than all the garden plants and becomes a tree, so that the birds of the air come and make nests in its branches.”

Here are four reasons critics are wrong.

1) The argument assumes that for God to be all-knowing, He must always speak in precise scientific detail. However, omniscience includes knowing how to communicate effectively. If a man says to his child, "the sun is setting behind the hills," the man isn't ignorant of astrophysics; he is choosing a level of communication appropriate for the listener.

In both ancient and modern speech, humans describe things as they appear to the eye rather than according to scientific classification. This is known as phenomenological language. We say the "sun rises" and "sun sets," even though we know the Earth is actually rotating. This isn't a lie or a scientific error; it is a functional description of a shared experience.

To the 1st-century Palestinian farmer, the mustard seed was the smallest thing they ever handled or planted. Jesus was speaking to a specific audience in a specific cultural context, not writing a botany textbook for the 21st century.

2) Another common argument is that Jesus’s statement is contextually limited to the world of Jewish agriculture.

In Matthew 13:31-32, Jesus specifies that the man took the seed and "planted it in his field." While orchid seeds are technically smaller, they were not "sown in the field" by farmers in the Levant at that time. Among the seeds known and used by his listeners for cultivation, the mustard seed was indeed the smallest.

3) A parable is a short story designed to illustrate a spiritual truth, not a scientific one. The hallmark of a parable is hyperbole - intentional exaggeration to make a point. The point is the contrast is between the insignificant beginning and the magnificent result.

If Jesus had used a technically smaller seed that his audience had never seen (like an orchid seed), the impact of the metaphor would have been lost. Effective communication requires using references that the audience understands.

4) From a strictly theological standpoint, many Christians point to the Doctrine of the Incarnation (specifically Kenosis). Philippians 2:7 suggests that Jesus "emptied himself" of certain divine prerogatives to become fully human.

Under this view, Jesus’s "all-knowing" nature was mediated through a human mind and human language to relate to humanity. Using local idioms and common knowledge was a part of being truly human.