If I ask you to write down the last 4 digits of your social security number, and then take you out to lunch and ask you how many dentists there are in Manhattan, there's going to be a high correlation between those two numbers. What happens is that the number psychologically makes you feel confident.
Nassim Nicholas TalebTo succeed in life requires a total inability to do anything that makes you uncomfortable when you look at yourself in the mirror.
Nassim Nicholas Taleb