russel h. conwell, the author of this book "acres of diamonds" makes a lot of emphasis in two aspects:
conwell talked about this hundred of times in usa and another countries, and he was convinced that success is within ourselves does not matter if we think our personal sources are useless.
his purpose was to show other people that we all have abilities and most of the times we do not know them.
rhetoric is the art of speaking or writing, is the art of express an idea in a fancy way, getting others attention and convince them so they accept that idea. conwell was a conferencist, and he really enjoyed talking in public, but the most important thing was his example. he helped his students and always was concerned about their overcoming. that example was the mainkey, that is why his work has helped companies, organizations, and had also inspired other great conferencists.