What do you mean, where there is a spear, there is a shield?

The three laws of Marxist philosophy are the law of dialectical unity, the law of mutual change of quality and the law of negation of negation, and the law of dialectical unity is also called the law of contradiction, that is, everything has its opposite side, such as men and women, young and old, contradiction, beauty and ugliness, right and wrong, high and low, internal and external, black and white, etc. In a word, all opposites are the unity of contradictions.

Dialectical materialism: All things and phenomena in the world are universal, and they are the process of eternal movement, change and development, and their driving force lies in the contradiction of things themselves.

example

The contradiction between the excessive consumption of earth resources, environmental protection and the rapid development of automobile industry.

The contradiction between the harm of cigarettes to health and the vigorous development of cigarette industry.

The contradiction between low wages and high housing prices.

The contradiction between Zhu Min's advocacy and stifling the right to speak.