• Hebrews 5:11-14
  of whom we have much to say, and hard to explain, since you have become dull of hearing. For though by this time you ought to be teachers, you need someone to teach you again the first principles of the oracles of God; and you have come to need milk and not solid food. For everyone who partakes only of milk is unskilled in the word of righteousness, for he is a babe. But solid food belongs to those who are of full age, that is, those who by reason of use have their senses exercised to discern both good and evil.
   
• Matthew 13:15
  For the hearts of this people have grown dull.
  Their ears are hard of hearing,
  And their eyes they have closed,
  Lest they should see with their eyes and hear with their ears,
  Lest they should understand with their hearts and turn,
  So that I should heal them."
   
• 1 Corinthians 3:1-2
  And I, brethren, could not speak to you as to spiritual people but as to carnal, as to babes in Christ. I fed you with milk and not with solid food; for until now you were not able to receive it, and even now you are still not able;
   
• Hebrews 2:1-3
  Therefore we must give the more earnest heed to the things we have heard, lest we drift away. For if the word spoken through angels proved steadfast, and every transgression and disobedience received a just reward, how shall we escape if we neglect so great a salvation, which at the first began to be spoken by the Lord, and was confirmed to us by those who heard Him,
   

Related Scriptures

• Romans 10:17
  So then faith comes by hearing, and hearing by the word of God.
   
• Hebrews 6:12
  that you do not become sluggish, but imitate those who through faith and patience inherit the promises.
   
• Hebrews 3:12
  Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God;