A primary requirement in every enterprise in habit-formation is self-confidence.
Even the best inborn potentialities for achievement do not render unnecessary patient and persistent practice.
The confidence essential to effective habit-making comes as a rule from knowledge of previous and related successes.
This is the best possible way to retain important details that you wish to remember in any unified field of knowledge, whether it be the field of economics, science, history, or any other-link them up with related items which you already know or wouldn't mind knowing.