按照唯物辩证法的观点，自然界的变化，主要地是由于自然界内部矛盾的发展。社会的变化，主要地是由于社会内部矛盾的发展，即生产力和生产关系的矛盾，阶级之间的矛盾，新旧之间的矛盾，由于这些矛盾的发展，推动了社会的前进，推动了新旧社会的代谢。唯物辩证法是否排除外部的原因呢？并不排除。唯物辩证法认为外因是变化… - Mao Zedong

[Our purpose is] to ensure that literature and art fit well into the whole revolutionary machine as a component part, that they operate as powerful weapons for uniting and educating the people and for attacking and destroying the enemy, and that they help the people fight the enemy with one heart and one mind.

It is an arduous task to ensure a better life for the several hundred million people of China and to build our economically and culturally backward country into a prosperous and powerful one with a high level of culture. And it is precisely in order to be able to shoulder this task more competently and work better together with all non-Party people who are actuated by high ideals and determined to institute reforms that we must conduct rectification movements both now and in the future, and constantly rid ourselves of whatever is wrong.

屈子当年赋楚骚，
手中握有杀人刀。
艾萧太盛椒兰少，
一跃冲向万里涛。