From "Trading for a Living" by Dr. A Elder
"If your mind is not in gear with the markets, or if you ignore changes in mass psychology of crowds, then you have no chance of making money trading."
"You can succeed in trading only if you handle it as a serious intellectual pursuit. Emotional trading is lethal. To help insure success, pratice defesive money management. A good trader watches his capitail as carefully as a professional scuba diver watches his air supply."
"Sucessful trading stands on three pillars: psychology, market analysis and trading systems, and money management."
The above is from the introduction.