There is a saying that "the principle of law lies outside the law", that is, "the principle of law lies in practice". That is to say, law must rely on certain extra-legal factors, and this extra-legal factor is mainly society. Therefore, when studying jurisprudence, we must grasp the connection between jurisprudence and society, that is, the rationality that law can exist in society. This is the essence of jurisprudence.

The concrete connotation of jurisprudence:

Jurisprudence refers to the basic spirit and theory of all laws that constitute a country or a department, and it is the source of law in a certain sense. Jurisprudence, as the source of law, aims to fill the blank of legal norms. In modern countries, it is generally believed that jurisprudence is one of the sources of civil law (according to the principle of legality in criminal cases, jurisprudence cannot be universally applied).

Because no matter how detailed the law is, it is impossible to stipulate all complex and changeable social phenomena without omission. Jurisprudence can supplement the deficiency of law, so some countries regard jurisprudence as the ultimate source of law, that is, if there is no provision in law, they must follow the custom; Those who are not used to it should be dealt with according to law.

Some western legal scholars believe that the current jurisprudence tends to be the main source; However, some scholars believe that the precedent itself does not have the nature of legal source, and only when the judgment based on the precedent becomes a precedent that can be cited in the trial of a case can it become a legal source.