The book
Conwell's essay began as a lecture he gave thousands of times, from a story he had heard of a man who sold his farm to go looking for diamonds and never knew the ground he left was full of them. The claim is local. The opportunity you are travelling toward is often the work already in front of you, undeveloped.
It is an argument against the elsewhere. Conwell talks about people who will not farm the land they have, or serve the customers already at the door, because wealth and usefulness look like a different city. He is preaching, and the preaching is the form. The usable piece is the inventory: what you have dismissed as ordinary.
It asks for the inventory, not for agreement with the lecture. Name the work, the skill, or the customer you have classed as not the real thing. Then name the search you are using to avoid it. The parable without that list is the summary everyone already knows.
It will not tell you the diamonds are there if they are not. The lecture overreaches when a real constraint, a region with no market, a skill you do not have, gets called an attitude. The edition should let you say so. Clason is the book if the problem is the purse, not the search.
Claim it on the book page. Acres of Diamonds.