Man's social practice is not confined to activity in production, but takes many other forms--class struggle, political life, scientific and artistic … - Mao Zedong

马克思主义的哲学认为，对立统一规律是宇宙的根本规律。这个规律，不论在自然界、人类社会和人们的思想中，都是普遍存在的。矛盾着的对立面又统一，又斗争，由此推动事物的运动和变化。矛盾是普遍存在的，不过按事物的性质不同，矛盾的性质也就不同。对于任何一个具体的事物说来，对立的统一是有条件的、暂时的、过渡的，因而是相对的，对立的斗争则是绝对的。

The Chinese people consider weddings as red happy events and funerals white happy events. I find them very rational. The Chinese know dialectics. Weddings will produce children. A child is split out of the body of the mother. It is a sudden change, a happy event. One individual is split into two or three, or even 10, like the aircraft carrier.
The common people find the deaths, changes and occurrences of new matters happy events. When a person dies, a memorial meeting is held. While the bereaved weep in mourning, they feel it is also a happy event. Actually, it is. Just imagine if Confucius were still living and here at this meeting in Huai-jen Hall, he would be over 2,000 years old and it wouldn’t be so good! If one subscribes to dialectics and yet disapproves of death, it will be metaphysics. Disasters are social phenomena, natural phenomena. Sudden changes are the most fundamental law of the universe. Birth is a sudden change; so is death. In the several decades from birth to death, it is a gradual change. If Chiang Kai-shek should die, we would clap our hands in joy. If Dulles should die, none of us would shed a tear. This is because the death of matters of the old society is a good thing, hoped for by everyone. While the birth of new things is good, their death is naturally not good. The failure of Russia’s 1905 revolution and the loss of our base in the South were equivalent to the seedlings destroyed by hailstorm and downpour. It is naturally not good. And the problem of replacing the destroyed seedlings arises.

We, the communists, do not want official positions; we want revolution. We must have a thoroughly revolutionary spirit and must be with the masses every hour, every minute. As long as we are with the masses, we shall always be victorious.