Mark 4:11
And he said to them, "To you has been given the secret of the kingdom of God, but to those outside everything is in parables;
Matthew 13:10-17
The disciples came and said to him, "Why do you speak to them in parables?"
Matthew 13:34-35
All these things Jesus spoke to the crowd in parables; and without a parable he did not speak to them.
Matthew 13:51-52
Jesus asked, "Have you understood all these things?" "Yes," they said to him.
Mark 4:34
But without a parable he did not speak to them. And when they were alone, he explained everything to his own disciples.
Acts 8:30-31
So Philip ran up to him, and heard him reading Isaiah the prophet, and asked, "Do you understand what you are reading?"
Hebrews 5:14
But solid food is for the mature, for those who have their sense trained by practice to distinguish good from evil.
2 Peter 3:16
He writes the same way in all his letters, speaking in them of these matters. His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.