In the book Think and Grow Rich by Napoleon Hill he shows many different habits and other methods that rich people used in order to become rich.
The engineer advised that the project had failed because the owners were not familiar with “Fault lines.” His calculations showed that the vein would be found just three feet from where the Darbys had stopped drilling! This is exactly where it was found.
This part of the book talks about discipline and persisting because when you feel like you have failed, success is right in front of you. In the story the author uses as an example, a family finds a mine and extracts many minerals from it, but nothing really valuable. Then, they decided to stop because they were not getting anything good from it. After talking to an expert, he showed them that three feet from where they had stopped drilling, a vein was found with many expensive things.