Causal analysis is important.

It is better to find a causal relationship than to obtain the Persian throne. This is a famous saying of the ancient Greek materialist philosopher Democritus. This sentence uses a selection relationship, and only chooses one. The contrast method highlights the importance of cause-and-effect relationships, reflecting the ancient sages' great emphasis on cause-and-effect analysis.

The book "Marx's Basic Principles" mentions that causal connection is an inevitable connection. When the cause exists, the result will inevitably occur.