The most successful traders do not predict markets—they leave that for financial commentators, economists, and analysts. Consistently winning traders follow the signals generated by their systems, strategies, or methodologies. They get out when their stops are hit or their trading edge is no longer present or active. They do not take profits before their methods tell them to.
Successful traders also look for many opportunities to exploit their trading edge; this makes them less likely to experience losing months in their accounts. Most traders do not understand this line of thought. As a result, they try to predict the market direction and fail to achieve the desired trading consistency.
(this is an excerpt from the Trading eCourse: Chapter 1 - First Things First, section 1.1 - Your Final Goal)