Mastery your memory or be slave to your subconscious.
Update (6:18 PM): It’s fascinating seeing what Mrs. Rand said about memory and the subconscious in discussing a concept she called “psycho-epistemology.” An excerpt:
The subconscious is an integrating mechanism. Man’s conscious mind observes and establishes connections among his experiences; the subconscious integrates the connections and makes them become automatic. For example, the skill of walking is acquired, after many faltering attempts, by the automatization of countless connections controlling muscular movements; once he learns to walk, a child needs no conscious awareness of such problems as posture, balance, length of step, etc.—the mere decision to walk brings the integrated total into his control.
A mind’s cognitive development involves a continual process of automatization. For example, you cannot perceive a table as an infant perceives it—as a mysterious object with four legs. You
perceive it as a table, i.e., a man-made piece of furniture, serving a certain purpose belonging to a human habitation, etc.; you cannot separate these attributes from your sight of the table, you experience it as a single, indivisible percept—yet all you see is a four-legged object; the rest is an automatized integration of a vast amount of conceptual knowledge which, at one time, you had to learn bit by bit. The same is true of everything you perceive or experience; as an adult, you cannot perceive or experience in a vacuum, you do it in a certain automatized context—and the efficiency of your mental operations depends on the kind of context your subconscious has automatized.
The process of forming, integrating and using concepts is not an automatic, but a volitional process—i.e., a process which uses both new and automatized material, but which is directed volitionally. It is not an innate, but an acquired skill; it has to be learned—it is the most crucially important part of learning—and all of man’s other capacities depend on how well or how badly he learns it.
This skill does not pertain to the particular content of a man’s knowledge at any given age, but to the method by which he acquires and organizes knowledge—the method by which his mind deals with its content. The method programs his subconscious computer, determining how efficiently, lamely or disastrously his cognitive processes will function. The programming of a man’s subconscious consists of the kind of cognitive habits he acquires; these habits constitute his psycho-epistemology.