A revolution is not a dinner party, or writing an essay, or painting a picture, or doing embroidery. It cannot be so refined, so leisurely and gentle… - Mao Zedong

If we have a correct theory but merely prate about it, pigeonhole it and do not put it into practice, then that theory, however good, is of no significance. Knowledge begins with practice, and theoretical knowledge is acquired through practice and must then return to practice. The active function of knowledge manifests itself not only in the active leap from perceptual to rational knowledge, but--and this is more important--it must manifest itself in the leap from rational knowledge to revolutionary practice. The knowledge which grasps the laws of the world, must be redirected to the practice of changing the world, must be applied anew in the practice of production, in the practice of revolutionary class struggle and revolutionary national struggle and in the practice of scientific experiment.

炸弹在未爆炸的时候，是矛盾物因一定条件共居于一个统一体中的时候。待至新的条件（发火）出现，才发生了爆炸。自然界中一切到了最后要采取外部冲突形式去解决旧矛盾产生新事物的现象，都有与此相仿佛的情形。

由此可知，任何过程如果有多数矛盾存在的话，其中必定有一种是主要的，起着领导的、决定的作用，其它则处于次要和服从的地位。因此，研究任何过程，如果是存在着两个以上矛盾的复杂过程的话，就要用全力找出它的主要矛盾。捉住了这个主要矛盾，一切问题就迎刃而解了。这是马克思研究资本主义社会告诉我们的方法。列宁和斯大林研究帝国主义和资本主义总危机的时候，列宁和斯大林研究苏联经济的时候，也告诉了这种方法。万千的学问家和实行家，不懂得这种方法，结果如堕烟海，找不到中心，也就找不到解决矛盾的方法。