John 16:18
So, they [again] said, "What does He mean by saying, 'A little while'? We do not know what He is talking about."
Matthew 16:9-11
Do you not understand yet or remember that five thousand people [were fed] with five loaves of bread and how many baskets [of pieces] were picked up [afterward]?
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]!
Hebrews 5:12
For certainly enough time has elapsed so that [by now] you ought to be teachers, [but instead] you are in need of having someone teach you again the basic principles of God's message. You have become people who need "milk" and not "solid food." [Note: The fundamental truths of Christianity are here figuratively spoken of as "milk," while the more advanced teaching, such as Christ's priesthood being like Melchizedek's, is called "solid food"].