John 14:5
Thomas said to him: Lord, we know not whither thou goest, and how can we know the way?
John 11:16
Then Thomas, who is called Didymus, said to his fellow-disciples: Let us also go, that we may die with him.
Mark 8:17-18
And Jesus perceived it, and said to them: Why do you reason, because you have no bread? Do you not yet perceive, nor understand? Is your heart still hardened?
Mark 9:19
And he answered them, and said: faithless generation! how long shall I be with you? how long shall I bear with you? Bring him to me.
Luke 24:25
And he said to them: inconsiderate, and slow of heart to believe all things 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
Then the other disciples said to him: We have seen the Lord. But he said to them: Unless I see in his hands the print of the nails, and put my finger in the print of the nails, and put my hand into his side, I will not believe.
Hebrews 5:11-12
Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.