Paul Blackham talks about Matthew chapter 8, verses 28 to 34.
You can listen to the audio here: The King 5
Paul Blackham talks about Matthew chapter 7 verses 13-14.
Listen to the audio here: matthew series 2 talk 10
A picture used by way of illustration during the talk can be found here: http://www.luziusschneider.com/php/bsweg/english/bswege.php