Simply put, Jesus teaches in parables to demonstrate the need for divine revelation to understand the mysteries of the kingdom and to reveal the spiritual condition of his listeners. Both of these realities are grounded in his understanding of Isaiah 6:9–10.

Although Jesus was not the first to use parables in his teaching, his extensive use of them was a distinct feature of his teaching style. But why? Some suggest that he simply harnessed the power of story to enhance his teaching. But Jesus himself explains why he used parables, and he grounds his explanation in a network of Old Testament texts, with Isaiah 6:9–10 as the star of the show.

Grasping Jesus’s purpose provides valuable lessons for our understanding and proclamation of the gospel.

Lest They Turn

Jesus’s explanation for why he teaches in parables is embedded within the parable of the sower and soils. (Although this parable is recorded in all three Synoptic Gospels, we will focus on Matthew’s version.)

The parable comes at the beginning of an extended section of parables focused on the nature of God’s kingdom (Matthew 13:1–52). After Jesus tells the crowd the parable of the sower (Matthew 13:1–9), the disciples ask him privately why he speaks to the crowds in parables (Matthew 13:10). Jesus responds by highlighting their privileged position as disciples: God has chosen to reveal the secrets of the kingdom to them (Matthew 13:11–12, alluding to “mystery” language used in Daniel). He then directly answers their question:

This is why I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand. Indeed, in their case the prophecy of Isaiah is fulfilled that says: “You will indeed hear but never understand, and you will indeed see but never perceive.” For this people’s heart has grown dull, and with their ears they can barely hear, and their eyes they have closed, lest they should see with their eyes and hear with their ears and understand with their heart and turn, and I would heal them. (Matthew 13:13–15, citing Isaiah 6:9–10)

Jesus’s statement that he teaches in parables alludes to Psalm 78:2 (which Matthew cites explicitly in Matthew 13:35), but the sensory malfunction language (ears that do not hear, eyes that do not see, hearts and minds that are dull) anticipates the quote from Isaiah 6:9–10. Why does Jesus turn here to explain his purpose to the disciples?

Unseeing Eyes, Unhearing Ears

In its original context, Isaiah 6:9–10 is part of God’s commission to Isaiah as a prophet. In response to seeing Yahweh exalted on his throne, Isaiah responds to Yahweh’s question, “Whom shall I send, and who will go for us?” with an emphatic, “Here I am! Send me” (Isaiah 6:1–8). Verses 9–10 then give the content of Isaiah’s message to rebellious Israel. God commissions him to denounce their spiritual deafness, blindness, and hardness of heart — the realities that keep Israel from responding to God’s call to repentance and restoration.

This was not a new response for Israel. It had been this way since Moses’s day, who used similar sensory malfunction language to describe Israel (Deuteronomy 29:2–4). Elsewhere, Scripture connects this sensory malfunction language to the effects of idolatry. Those who worship idols become like them, having eyes that cannot see, ears that cannot hear, and hearts that do not understand (Isaiah 44:9–20; Psalm 115:3–8).

But when Jesus cites Isaiah 6:9–10 and applies it to the listening crowds, he is doing more than simply identifying a recurring pattern in redemptive history.

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