Now there are two different attitudes towards learning from others. One is the dogmatic attitude of transplanting everything, whether or not it is su… - Mao Zedong

As already mentioned, so long as classes exist, contradictions between correct and incorrect ideas in the Communist Party are reflections within the Party of class contradictions. At first, with regard to certain issues, such contradictions may not manifest themselves as antagonistic. But with the development of the class struggle, they may grow and become antagonistic. The history of the Communist Party of the Soviet Union shows us that the contradictions between the correct thinking of Lenin and Stalin and the fallacious thinking of Trotsky, Bukharin and others did not at first manifest themselves in an antagonistic form, but that later they did develop into antagonism.

As we have said, one must not treat all the contradictions in a process as being equal but must distinguish between the principal and the secondary contradictions, and pay special attention to grasping the principal one. But, in any given contradiction, whether principal or secondary, should the two contradictory aspects be treated as equal? Again, no. In any contradiction the development of the contradictory aspects is uneven. Sometimes they seem to be in equilibrium, which is however only temporary and relative, while unevenness is basic. Of the two contradictory aspects, one must be principal and the other secondary. The principal aspect is the one playing the leading role in the contradiction. The nature of a thing is determined mainly by the principal aspect of a contradiction, the aspect which has gained the dominant position.

Literally the two slogans -- let a hundred flowers blossom and let a hundred schools of thought contend -- have no class character; the proletariat can turn them to account, and so can the bourgeoisie or others. Different classes, strata and social groups each have their own views on what are fragrant flowers and what are poisonous weeds. Then, from the point of view of the masses, what should be the criteria today for distinguishing fragrant flowers from poisonous weeds? In their political activities, how should our people judge whether a person's words and deeds are right or wrong? On the basis of the principles of our Constitution, the will of the overwhelming majority of our people and the common political positions which have been proclaimed on various occasions by our political parties, we consider that, broadly speaking, the criteria should be as follows: (1) Words and deeds should help to unite, and not divide, the people of all our nationalities.
(2) They should be beneficial, and not harmful, to socialist transformation and socialist construction.
(3) They should help to consolidate, and not undermine or weaken, the people's democratic dictatorship.
(4) They should help to consolidate, and not undermine or weaken, democratic centralism.
(5) They should help to strengthen, and not shake off or weaken, the leadership of the Communist Party.
(6) They should be beneficial, and not harmful, to international socialist unity and the unity of the peace-loving people of the world.