Those experienced in work must take up the study of theory and must read seriously; only then will they be able to systematize and synthesize their experience and raise it to the level of theory, only then will they not mistake their partial experience for universal truth and not commit empiricist errors.
Mao ZedongOur enemies are all those in league with imperialism - the warlords, the bureaucrats, the comprador class, the big Landlord class and the reactionary section of the intelligentsia attached to them. The leading force in our revolution is the industrial proletariat. Our closest friends are the entire semi-proletariat and petty bourgeoisie. As for the vacillating middle bourgeoisie, their right wing may become our enemy and their left wing may become our friend - but we must be constantly on our guard and not let them create confusion within our ranks.
Mao ZedongAt no time and in no circumstances should a Communist place his personal interests first; he should subordinate them to the interests of the nation and of the masses. Hence, selfishness, slacking, corruption, seeking the limelight, and so on, are most contemptible, while selflessness, working with all one's energy, whole-hearted devotion to public duty, and quiet hard work will command respect.
Mao Zedong