Plucking and Tearing,
Building and Planting
Jeremiah 1:10
Jeremiah 31:28

David Buttrick, a preacher and teacher of preaching, says that a sermon should be constructed in sections.  Each section should begin with a strong statement and end with a version of the same statement, making the first and last sentences of each section almost identical.  In this way those listening will be more likely to get the point.
I remember reading somewhere that if a playwright wants you to remember something, he says it three times.  By the third time it has probably stuck in your brain, if only subliminally.

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