There is a bit of contradiction on this point because there are many rules of trade. Instead of other things, think first, then check the market, compare it and finally take the decision is a simple thing. But, your strategies and approaches must be according to the fundamentals. All the things like risk assessment, discipline, analysis, your patience, learning towards the trades, strategy of entry and exit from markets are not psychological thing, these are practical who gives you profit and also passion to bond with the market. Remember that trading involve risks, and no set of principles guarantees success.