Matthew 13:51
"Have you understood all these things?" They replied, "Yes."
Matthew 13:11
He replied, "You have been given the opportunity to know the secrets of the kingdom of heaven, but they have not.
Matthew 13:19
When anyone hears the word about the kingdom and does not understand it, the evil one comes and snatches what was sown in his heart; this is the seed sown along the path.
Matthew 15:17
Don't you understand that whatever goes into the mouth enters the stomach and then passes out into the sewer?
Matthew 16:11
How could you not understand that I was not speaking to you about bread? But beware of the yeast of the Pharisees and Sadducees!"
Matthew 24:15
"So when you see the abomination of desolation -- spoken about by Daniel the prophet -- standing in the holy place (let the reader understand),
Mark 4:34
He did not speak to them without a parable. But privately he explained everything to his own disciples.
Mark 7:18
He said to them, "Are you so foolish? Don't you understand that whatever goes into a person from outside cannot defile him?
Mark 8:17-18
When he learned of this, Jesus said to them, "Why are you arguing about having no bread? Do you still not see or understand? Have your hearts been hardened?
Luke 9:44-45
"Take these words to heart, for the Son of Man is going to be betrayed into the hands of men."
Acts 8:30-31
So Philip ran up to it and heard the man reading Isaiah the prophet. He asked him, "Do you understand what you're reading?"
1 John 5:20
And we know that the Son of God has come and has given us insight to know him who is true, and we are in him who is true, in his Son Jesus Christ. This one is the true God and eternal life.