John 14:5
Thomas said to Jesus, "Lord, we do not know where you are going; how could we [possibly] know the way [to get there]?"
John 11:16
Then Thomas, which means, "The Twin," said to his fellow disciples, "Let us go too, so we can die with Him." [i.e., by being stoned to death with Jesus. See 11:8].
Mark 8:17-18
Jesus, being aware of what they were thinking, said, "Why are you reasoning about not having any bread? Have you not yet perceived or understood? Have your hearts become insensitive?
Mark 9:19
Jesus said to them, "You generation of faithless people How long must I be with you [i.e., before you understand]? How long do I have to be patient with you? Bring the sick boy to me."
Luke 24:25
Then Jesus said to them, "You foolish men! How slow your minds are to believe everything the prophets have spoken [in their writings]!
John 15:12
My commandment [to you] is this: You should love one another just as I have loved you.
John 20:25-28
So, the other disciples told him, "We have seen the Lord." But he replied to them, "I will not believe [it] unless I see the scars of the nails in His hands, and put my finger on the nail scars, and put my hand in His side."
Hebrews 5:11-12
[Now] we have many things to say about Melchizedek, but because of your slowness to grasp things, they are hard to explain.