The core lesson of the book is that your internal "thermostat" is set to a certain amount of money. If you earn more than that, you will subconsciously sabotage yourself until you return to your comfort zone.
To change this:
Eker suggests splitting your income into different accounts to change your psychology:
The central premise of T. Harv Eker’s book is that everyone has a "Money Blueprint" (Un Plan Maestro Financiero). This is your internal programming regarding money, which determines your financial life.
If you want to change your results (your wealth), you must start by changing your programming.