You can't solve a problem? Well, get down and investigate the present facts and [the problem's] past history! When you have investigated the problem thoroughly, you will know how to solve it.
Mao ZedongTaken as a whole, the Chinese revolutionary movement led by the Communist Party embraces the two stages, i.e., the democratic and the socialist revolutions, which are two essentially different revolutionary processes, and the second process can be carried through only after the first has been completed. The democratic revolution is the necessary preparation for the socialist revolution, and the socialist revolution is the inevitable sequel to the democratic revolution. The ultimate aim for which all communists strive is to bring about a socialist and communist society.
Mao ZedongConditions are changing all the time, and to adapt one's thinking to the new conditions, one must study. Even those who have a better grasp of Marxism and are comparatively firm in their proletarian stand have to go on studying, have to absorb what is new and study new problems.
Mao Zedong