After understanding so much theory, why are we still not good at investing? Perhaps it's because we are far from understanding ourselves. Our brains often drive us to do things that are illogical from an investment perspective, but these things make complete sense emotionally. That's why knowing the right answer and doing the right thing are two entirely different matters. When you make decisions about money, your brain, with its chaotic and magical complexity, may be in its best or worst state, but it also most reflects human nature.