When you're afraid keep your mind on what you have to do. And if you have been thoroughly prepared you will not be afraid.
Dale CarnegieGive your problem all the thought you possibly can before a solution is reached. But when the matter is settled and over with, worry not at all.
Dale CarnegiePsychiatrists declare that most of our fatigue derives from our mental and emotional attitudes... What kinds of emotional factors tire the sedentary (or sitting) worker? Joy? Contentment? No! Never! Boredom, resentment, a feeling of not being appreciated, a feeling of futility, hurry, anxiety, worry-those are the emotional factors that exhaust the sitting worker, make him susceptible to colds, reduce his output, and send him home with a nervous headache. Yes, we get tired because our emotions produce nervous tensions in the body.
Dale Carnegie