John 14:5
Thomas said to Him, "Lord, we do not know where you are going, and so how can we know the way?"
John 11:16
Then Thomas the Twin said to his fellow-disciples, "Let us go too, and die with Him."
Mark 8:17-18
And as He noticed it He said to them, "Why are you discussing the fact that you have no bread? Do you not yet know nor understand? Are your minds so dull?
Mark 9:19
He answered them, "Oh, you unbelieving people of the times! How long must I be with you! How long must I put up with you! Bring him to me."
Luke 24:25
Then He said to them, "O men sluggish in mind and slow in heart to believe all that the prophets have said!
John 15:12
This is my command to you, to keep on loving one another as I have loved you.
John 20:25-28
So the rest of the disciples kept saying to him, "We have seen the Lord!" But he said to them, "Unless I see the nail prints in His hands, and put my finger into them, and put my hand into His side, I will never believe it!"
Hebrews 5:11-12
I have much to say to you about Him, but it is difficult to make it clear to you, since you have become so dull in your spiritual senses.