In the course of investigation and study, one should listen to opinions from various quarters, be they positive or negative. The point here is that one 'should take a sniff at everything and distinguish the good from the bad before they decide whether to welcome it or boycott it.' There may be different views on the same thing among the people and one must distinguish between them after having heard them. One must absorb and act according to the correct opinions, and criticize and help to rectify the mistaken ones. It is necessary to resolutely expose and denounce the attack from the class enemy and transform poisonous weeds into fertilizer. So long as we stick to the Marxist method of class analysis, we can in our investigation and study truly reflect the actual features of the objective things and avoid committing 'Left' or Right mistakes.
An abridged translation of an article in "Hongqi" No. 4, 1971
