"When we know that the cause of something is in ourselves, and that we (ourselves) are one of the few things in the universe that we have the right and ability to change, we begin to get a sense of the choices we really do have, an inkling of the power we have, a feeling of being in charge... of our lives, of our future, of our dreams."

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The ability to change one's mind is probably a key characteristic of the successful investor. Dogmatic and rigid personalities rarely, if ever, succeed in the markets. The markets are a dynamic process, and sustained investment success requires the ability to modify and even change strategies as markets evolve.

— Jack D. Schwager