Anand Kumar
I've long believed - or rather, I've known it to be true - that investment success or failure is entirely about the investor's psychology. We might say that so and so did badly because of wrong asset choices, mistiming the market or a bad economy, but those are just proximal causes, the symptoms. The root cause is always the investor's own mindset, knowledge and attitude. Of course, this is true not just in investing but in many other aspects of life.