The necessity for struggle is one of the clever devices through which nature forces individuals to expand, develop, progress, and become strong through resistance. . .We are forced to recognize that this great universal necessity for struggle must have a definite and useful purpose. That purpose is to force the individual to sharpen his wits, arouse his enthusiasm, build up his spirit of faith, gain definiteness of purpose, develop his power of will, and inspire his faculty of imagination to give him new uses for old ideas and concepts. . .
Napoleon HillPositive and negative emotions cannot occupy the mind at the same time. One or the other must dominate. It is your responsibility to make sure that positive emotions constitute the dominating influence of your mind. Here the law of HABIT will come to your aid. Form the habit of applying and using the positive emotions! Eventually, they will dominate your mind so completely, that the negatives cannot enter it.
Napoleon Hill