John 14:5
Thomas said to him, "Lord, we do not know where you are going. How can we know the way?"
John 11:16
So Thomas, called the Twin, said to his fellow disciples, "Let us also go, that we may die with him."
Mark 8:17-18
And Jesus, aware of this, said to them, "Why are you discussing the fact that you have no bread? Do you not yet perceive or understand? Are your hearts hardened?
Mark 9:19
And he answered them, "O faithless generation, how long am I to be with you? How long am I to bear with you? Bring him to me."
Luke 24:25
And he said to them, "O foolish ones, and slow of heart to believe all that the prophets have spoken!
John 15:12
"This is my commandment, that you love one another as I have loved you.
John 20:25-28
So the other disciples told him, "We have seen the Lord." But he said to them, "Unless I see in his hands the mark of the nails, and place my finger into the mark of the nails, and place my hand into his side, I will never believe."
Hebrews 5:11-12
About this we have much to say, and it is hard to explain, since you have become dull of hearing.