1. The hardest thing about investing is doing nothing because money is earned by sitting still. The art of investing is often the art of inaction. Most of the money made comes from long periods of doing nothing.

2. The human brain is inherently not suited for investing; it is designed to escape from predators in the jungle, not to endure in the market. Moving quickly in the jungle means survival, but moving quickly in the stock market can mean death. Therefore, investing is counter to human nature.
3. The most critical action in investing is doing nothing; it sounds simple, but it is the most expensive skill I have seen because you must first be able to tolerate boredom, and humans are naturally averse to boredom.
4. Money in the market flows from impulsive traders to those who are calm.