Traders who can truly make big money long-term

often possess four abilities simultaneously: mathematics, finance, psychology, and philosophy.
Mathematics tells them where the probability lies.
Finance tells them what the rules are.
Psychology tells them how to control themselves.
Philosophy tells them how to face uncertainty.
Therefore, what trading truly teaches people may not be how to make money, but how to face a world full of uncertainty—acknowledging that they can be wrong, accepting that the world is uncontrollable, betting on probabilities, and remaining calm in the face of outcomes.