A person becomes contemptible who tamely sits still, and submits to insults, without attempting either to repel or to revenge them. We cannot enter into his indifference and insensibility: we call his behaviour mean-spiritedness, and are as really provoked by it as by the insolence of his adversary. Even the mob are enraged to see any man submit patiently to affronts and ill usage.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“Upon most occasions, the greater his patience, his mildness, his humanity, provided it does not appear that he wants spirit, or that fear was the motive of his forbearance, the higher their resentment against the person who injured him. The amiableness of the character exasperates their sense of the atrocity of the injury. Those passions, however, are regarded as necessary parts of the character of human nature. A person becomes contemptible who tamely sits still, and submits to insults, without attempting either to repel or to revenge them. We cannot enter into his indifference and insensibility: we call his behaviour mean-spiritedness, and are as really provoked by it as by the insolence of his adversary. Even the mob are enraged to see any man submit patiently to affronts and ill usage. They desire to see this insolence resented, and resented by the person who suffers from it. They cry to him with fury, to defend, or to revenge himself. If his indignation rouses at last, they heartily applaud, and sympathize with it.” source