"the most important attribute"

A great trader and a friend of mine once said:  “I will tell you I am good at trading. I am good at investing. I am good at making decisions. I am good at admitting mistakes and that’s my best trait. I am really, really good at admitting mistakes. And that’s to me the most important attribute that an investor, that a trader, that somebody who’s trying to make a living matching wits in the market can have is the ability to admit that they are wrong. That trumps all other concerns. Education doesn’t seem to have that much viability to me. It’s the ability to say I’m wrong.”