Mark 4:11
And he said to them: To you it is given to know the mystery of the kingdom of God; but to those who are without, all things are done in parables;
Matthew 13:10-17
And the disciples came and said to him: "Why dost thou speak to them in parables?
Matthew 13:34-35
All these things Jesus spoke to the multitudes in parables, and without a parable he did not speak to them;
Matthew 13:51-52
Jesus said to them: Have you understood all these things? They said to him: Yes, Lord.
Mark 4:34
But without a parable he did not speak to them; but when alone, he explained all things to his disciples.
Acts 8:30-31
And Philip ran forward, and heard him reading the prophet Isaiah; and he said: Do you understand what you are reading?
Hebrews 5:14
But strong food belongs to those who are of mature age, who, by use, have their internal senses exercised to the discerning of both good and evil.
2 Peter 3:16
as also in all his letters, speaking in them of these things, in which are some things hard to be understood, which the unlearned and unstable wrest, as they do also the other scriptures, to their own destruction.