Matthew 13:34
All these things Jesus said to the people in the form of stories; and without a story he said nothing to them:
Mark 4:33-34
And with a number of such stories he gave them his teaching, as they were able to take it:
John 16:25
All this I have said to you in veiled language: but the time is coming when I will no longer say things in veiled language but will give you knowledge of the Father clearly.
Matthew 13:13
For this reason I put things into the form of stories; because they see without seeing, and give ear without hearing, and the sense is not clear to them.