How does Og Mandino use imagery in The Greatest Miracle in the World?

Imagery:

"We sat, after the exchange, in a stillness interrupted only by an occasional rumble from a truck or bus bouncing along the ruts of Devon Avenue. I sipped the sherry and felt more relaxed and at peace with the world than I had in many months." Chapter 2, pg. 25

"The thick brown manila envelope rested ominously on my desk on that Monday that I shall never forget." Chapter 7, pg. 84