I rarely do quotes, but this one struck me for the second time. It must be fate. I think I found it last summer while reading "The Wisdom of the Crowds". I picked the book back up and it's on the Delta e-ticket I used as a bookmark.
"An honest tradesman is a jewel indeed, and is valued whereever he is found" - Daniel Defoe.
A quick search this morning indicates Daniel Defoe was author of (among other things) Robinson Crusoe and was himself a tradesman. Ironically, he was sometimes not confused by being honest.