On emotions: 

The unsuccessful investor is best friends with hope, and hope skips along life’s path hand in hand with greed when it comes to the stock market. Once a stock trade is entered, hope springs to life. It is human nature to be positive, to hope for the best. Hope is an important survival technique. But hope, like its stock market cousin’s ignorance, greed, and fear, distorts reason. See the stock market only deals in facts, in reality, in reason, and the stock market is never wrong. Traders are wrong. Like the spinning of a roulette wheel, the little black ball tells the final outcome, not greed, fear or hope. The result is objective and final, with no appeal.
I believe that uncontrolled basic emotions are the true and deadly enemy of the speculator; that hope, fear, and greed are always present, sitting on the edge of the psyche, waiting on the sidelines, waiting to jump into the action, plow into the game.
Fear keeps you from making as much money as you ought to.

On herd behavior:

I believe that the public wants to be led, to be instructed, to be told what to do. They want reassurance. They will always move en masse, a mob, a herd, a group, because people want the safety of human company. They are afraid to stand alone because they want to be safely included within the herd, not to be the lone calf standing on the desolate, dangerous, wolf-patrolled prairie of
contrary opinion.

On cash:

First, do not be invested in the market all the time. There are many times when I have been completely in cash, especially when I was unsure of the direction of the market and waiting for a confirmation of the next move….Second, it is the change in the major trend that hurts most speculators. (more…)