It Isn't The Head But The Stomach

All The Math You Need In The Stock Market You Get In The Fourth Grade.

The List Of Qualities (an Investor Should Have) Include Patience, Self-reliance, Common Sense, A Tolerance For Pain, Open-mindedness, Detachment, Persistence, Humility, Flexibility, A Willingness To Do Independent Research, An Equal Willingness To Admit Mistakes, And The Ability To Ignore General Panic.

There's No Use Diversifying Into Unknown Companies Just For The Sake Of Diversity. A Foolish Diversity Is The Hobgoblin Of Small Investors. That Said, It Isn't Safe To Own Just One Stock, Because In Spite Of Your Best Efforts, The One You Choose Might Be The Victim Of Unforeseen Circumstances. In Small Portfolios, I'd Be Comfortable Owning Between Three And Ten Stocks.

The Natural-born Investor Is A Myth.

You Should Not Buy A Stock Because It's Cheap But Because You Know A Lot About It.