Positive Mindset Helps to Profit in Trading. Greed can ruin a trading career. From my experience, when I came to new trading, I wanted to earn a lot of money, so I would face losses by over-trading. Here I have indulged my greed and made a lot of losses. So there is no need to be greed. Greed destroys people. And if you want to trade, you must give up greed. To be greedy in trading means to bring your danger. So to give up greed by keeping a positive mindset.