I was showing a visitor around our Maryknoll Region in Tanzania. We hadn’t gone
more than 15 miles when my Land-Rover shuddered to a stop.  I pulled out the
automotive manual and attempted to locate the source of the difficulty.  After
several hours, a truck pulled up.  The driver, an elderly African, got out to
help us.  He wriggled under our vehicle while his passenger pored over our
manual.  Emerging with a smile, the earnest mechanic successfully started up our
Land-Rover.  His passenger began telling him about the splendid manual we had. 
The elderly man replied, "The foreigners may use books, but we Africans use our
heads."