At certain times in the revolutionary struggle, the difficulties outweigh the favorable conditions and so constitute the principal aspect of the contradiction and the favorable conditions constitute the secondary aspect. But through their efforts the revolutionaries can overcome the difficulties step by step and open up a favorable new situation, thus a difficult situation yields place to a favorable one.
Mao ZedongRevolutionary war is an antitoxin which not only eliminates the enemy's poison but also purges us of our own filth.
Mao ZedongWhile swimming in the heavily polluted rivers of south China, despite the pleadings of his security guards and his physician, he would chide his companions if they began to panic in the water: Maybe you're afraid of sinking, Don't think about it. If you don't think about it, you won't sink. If you do, you will.
Mao Zedong