Mark 4:11
He went on to say to them. "The secret truth concerning the kingdom of God has been given to you, but to those outside everything is told in parables,
Matthew 13:10-17
Now when his disciples came up to him, they said,
Matthew 13:34-35
Jesus told all this to the crowd in parables; indeed he never spoke to them except in parables,
Matthew 13:51-52
"Have you understood all this?" he asked. "We have," they answered him.
Mark 4:34
and to them it was his practice never to speak except in parables. But he used to explain everything in private to his disciples.
Acts 8:30-31
So Philip ran up, and heard him reading Isaiah the Prophet, and said to him. "Do you understand what you are reading?"
Hebrews 5:14
But solid food is for adults, that is, for those who by constant practise have their faculties trained to discriminate between good and evil.
2 Peter 3:16
It is the same in all his letters when he speaks of these things. There are indeed some things in his letters hard to understand, which the ignorant and the shifty wrest, as also they do the other Scriptures, to their own destruction.