John 14:5
"Master," said Thomas, "we do not know where you are going. In what sense do we know the way?"
John 11:16
"Let us go also," Thomas, the Twin, said to his fellow disciples, "that we may die with him."
Mark 8:17-18
He perceived what they were saying, and He said to them, "What is this discussion of yours about having no bread? Do you not yet see and understand? Are your minds so dull of comprehension?
Mark 9:19
"O unbelieving generation!" replied Jesus; "how long must I be with you? how long must I have patience with you? Bring the boy to me."
Luke 24:25
"O dull-witted men," He replied, "with minds so slow to believe all that the Prophets have spoken!
John 15:12
This is my commandment to you, to love one another as I have loved you.
John 20:25-28
So the rest of the disciples told him, "We have seen the Master!" His reply was, "Unless I see in his hands the wound made by the nails and put my finger into the wound, and put my hand into his side, I will never believe it."
Hebrews 5:11-12
Concerning Him we have much to say, and much that it would be difficult to make clear to you, since you have become so dull of apprehension.