" When we feel discouraged, it is so easy to feel more discouraged; when we feel dissatisfied, it is only a step to that condition that is practically intolerable. It is therefore necessary to stop all detrimental feeling in the beginning. Do not permit a single adverse feeling to continue for a second. Change the mind at once by turning your attention upon something that will make you feel better. Resolve to feel the way you want to feel under all circumstances, and you will gradually develop the power to do so. "

― , Your Forces and How to Use Them