Matthew 13:35 shows Jesus' parables fulfill prophecy about hidden things — complementing the hardening reason in Matthew 13:14.

Isaiah 6:9 is the exact prophecy quoted here, where God commands Isaiah to make the people hear but not understand.

Isaiah 6:10 continues the prophecy: hearts are calloused, eyes closed, ears dulled—the same hardening quoted here.

Acts 28:25-27 has Paul quoting the same Isaiah passage to unbelieving Jews in Rome.

John 12:40 quotes Isaiah 6:10 verbatim, describing God blinding eyes and hardening hearts.

Ezekiel 12:2 uses nearly identical language about rebellious Israel having eyes that see not and ears that hear not.

John 12:39 directly cites the same Isaiah prophecy about hardening, explaining why many could not believe.

Mark 4:11 gives the same explanation for parables—those outside are not given the secret of the kingdom.

Luke 8:10 is the parallel account, where Jesus explains that parables conceal truth from those not meant to understand.

Mark 8:18 uses the same 'eyes but not see, ears but not hear' imagery, echoing Isaiah's indictment of spiritual blindness.

Romans 11:7 echoes the same hardening theme — Israel failed to understand, the rest were hardened.

Acts 28:26 directly quotes the same Isaiah passage Jesus cites here, applying it to Jewish unbelief.

John 10:6 shows the same dynamic: listeners hear but fail to understand Jesus' figurative speech.

Mark 3:5 describes Jesus grieving over hardness of heart — the same spiritual condition that prevents seeing and hearing in Matthew 13:14.

Isaiah 44:18 says idolaters' eyes are plastered shut and hearts cannot understand — directly parallel to the Isaiah 6 quote Jesus uses.

Isaiah 29:18 promises the deaf shall hear and blind see — the reversal of the spiritual dullness Jesus describes.

Isaiah 42:19 calls Israel blind and deaf as God's servant — the same condition Jesus says the crowds have.

Romans 9:18 develops God's sovereign hardening, directly relating to the hardened hearts described in the Isaiah quotation.

In Isaiah 28:13, God's word becomes a trap for the disobedient, mirroring the hardening judgment Jesus quotes in Matthew 13:14.

Job 33:14 says God speaks but man does not perceive it, paralleling the idea of hearing without understanding.

Luke 19:42 parallels this: things hidden from eyes because unrecognized, showing the same spiritual blindness theme.

Ezekiel 20:49 has the people complain he speaks parables — just as Jesus' parables were not understood by the hard-hearted.

Romans 11:8-10 quotes a different OT passage about spiritual dullness, reinforcing the theme of divine hardening.

2 Corinthians 3:14 speaks of minds hardened and a veil over the old covenant, similar to the blindness theme.