When I was a real estate agent, I read every sales book I could get my hands on, from Napoleon Hill to Zig Ziglar. I avoided Og Mandino’s book, “The Greatest Salesman in the World” because I thought it was too Christian for my taste. Sadly, because of this, I missed out on some of the greatest inspirational writings.
For all of Og Mandino’s quotations, see here:
For a biography of Og Mandino: