One trade, whether successful or not, is just a drop in the ocean among millions of trades in your long career. Do not become complacent after a single success, nor be overly distressed by a single failure. A calm mind is always the strongest weapon for a professional trader. When you become impatient, reckless, fearful, or anxious due to market fluctuations and asset changes, whether you make a profit or a loss, you have already lost. The market's waves will amplify your emotions infinitely, exhausting you and delivering a fatal blow.