In Hebrews 6:12, the same Greek word 'nōthroi' warns against becoming sluggish — a direct link within the same epistle to the dullness mentioned earlier.

Matthew 13:15 quotes Isaiah 6:10 about dull ears — the same spiritual deafness addressed here.

Acts 28:27 quotes Isaiah about a people with dull ears and closed eyes — the same OT background for this dullness.

John 16:12 Jesus says He has more to say but they cannot bear it — directly parallel to the difficulty of speaking here because of dull hearing.

Luke 24:25 calls the disciples 'slow of heart to believe' — identical concept of spiritual slowness as here.

Mark 8:21 continues the rebuke: 'Do you not yet understand?' — same failure to comprehend, reinforcing the dullness.

Mark 8:18 echoes the same spiritual deafness: 'having ears do you not hear?' — directly mirroring dull hearing.

Isaiah 6:10 describes people with dull hearts and heavy ears — the very condition referenced here as 'dull of hearing'.

Mark 7:18 asks 'Are you also without understanding?' — another instance of the disciples' spiritual dullness.

In John 3:12, Jesus similarly laments that earthly truths are not believed, making heavenly truths hard to teach — same frustration with hard-hearted listeners.

In John 6:60, disciples call Jesus’ teaching a 'hard saying' and struggle to accept it — reflecting the same dullness of hearing that hinders deeper understanding.

Mark 4:33 notes Jesus spoke parables 'as they were able to hear' — the same limitation of hearing ability addressed here.

Mark 4:13 rebukes the disciples for not understanding the parable — directly parallels the dullness of hearing here.

In 1 Corinthians 3:2, Paul says he fed them milk, not solid food, because they were not ready — the exact same concept of spiritual immaturity and inability to receive deep teaching.

In 1 Corinthians 15:34, Paul calls believers to 'awake' and shame ignorance of God — directly addressing the spiritual dullness that hinders understanding.

In 2 Timothy 2:15, Paul urges diligent study and correct handling of truth — the antidote to the dullness that makes teaching hard.

In 2 Timothy 3:7, 'always learning but never able to know the truth' perfectly describes the dull hearing that prevents progress.