Performance is based not just on ability. You know that from experience. On different days, even though your ability does not change, your performance will vary widely. The difference is due largely to your state of mind. Yes, ability is important. Yet unless you’re able to manage your attitude, performance will suffer.
Your attitude is determined by you, by the way you control your mind and your body. It is independent of external factors. You can always find a reason to be depressed. You can always find a reason to be happy. You can always find a reason to be despairing, or a reason to be positive. Yet external reasons do not really matter because they are unnecessary.
The only reason you need to be happy, positive and enthusiastic is because you have chosen to be so, and because it will substantially improve your performance in any endeavor. On any day, in any situation, with any person, you can choose to move forward with a positive, winning attitude. Keep that in mind, and watch your effectiveness soar.
— Ralph Marston