The necessary ability for investment

I think that there are four abilities to succeed in investment. Two already talked.

• Continue having the same passion, spirit and motivation.
  
• Appropriate distance from the money.

The other two are in "The Intelligent Investor (by Benjamin Graham)". Please read the preface written by Warren Buffett.

"To invest successfully over a lifetime does not require a stratospheric IQ, unusual business insights, or inside information. What's needed is a sound intellectual framework for making decisions and the ability to keep emotions from corroding that framework."

The third and the fourth are these.

• Sound intellectual framework for making decisions.
  
• Ability to keep emotions from corroding that framework.
  

If we were to get these four abilities, we could earn money enough, even if we don't depend on equity investment. I wrote "The necessary ability for investment" as a title, but in fact, it may be "The necessary ability to succeed in our life".