John 14:5
"We do not know where you are going, Master," said Thomas; "so how can we know the way?"
John 11:16
At this, Thomas, who was called 'The Twin,' said to his fellow-disciples: "Let us go too, so that we may die with him."
Mark 8:17-18
And, noticing this, Jesus said to them: "Why are you talking about your being short of bread? Do not you yet see or understand? Are your minds still so slow or comprehension?
Mark 9:19
"O faithless generation!" exclaimed Jesus. "How long must I be with you? how long must I have patience with you? Bring the boy to me."
Luke 24:25
Then Jesus said to them: "O foolish men, slow to accept all that the Prophets have said!
John 15:12
This is my command--Love one another, as I have loved you.
John 20:25-28
So the rest of the disciples said to him: "We have seen the Master!" "Unless I see the marks of the nails in his hands," he exclaimed, "and put my finger into the marks, and put my hand into his side, I will not believe it."
Hebrews 5:11-12
Now on this subject I have much to say, but it is difficult to explain it to you, because you have shown yourselves so slow to learn.