Quotations from Ai Yuejin's speech by Professor Nankai. Ai Yuejin, male, born in July 1958, is a Marxist theorist, a proletarian fighter, a professor and doctoral supervisor at the School of Marxism of Nankai University, the founder of the military discipline of Nankai University, a famous speaker, and the vice president of Tianjin Sinology Research Association. His research fields are military thoughts, social etiquette and so on. "Dignity is only above the blade of the sword, and truth is only within the range of the cannon." The quotations from Professor Ai Yuejin's speech in Nankai mainly expressed how China's dignity was restored. It is made of countless patriotic soldiers with blood. Forgetting history itself is a betrayal. A country and a nation should dare to show their swords. The situation in the world is not a joke, but a real jungle law, and this jungle is far more complicated than the general jungle.