25 Then Jesus said to them: "O foolish men, slow to accept all that the Prophets have said!
Luke 24:25 Cross References - Twentieth_Century
Mark 7:18
18 "What, do even you understand so little?" exclaimed Jesus. "Do not you see that there is nothing external to a man, which by going into a man, can 'defile' him,
Mark 8:17-18
Mark 9:19
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."
Mark 16:14
14 Later on, he made himself known to the Eleven themselves as they were at a meal, and reproached them with their want of faith and their stubbornness, because they did not believe those who had seen him after he had risen from the dead.
Hebrews 5:11-12
11 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.
12 For whereas, considering the time that has elapsed, you ought to be teaching others, you still need some one to teach you the very alphabet of the Divine Revelation, and need again to be fed with 'milk' instead of with 'solid food.'