Immanuel Kant 
The Science of Right [EPUB ebook] 

The Science of Right has for its object the principles of all the laws which it is possible to promulgate by external legislation. Where there is such a legislation, it becomes, in actual application to it, a system of positive right and law; and he who is versed in the knowledge of this system is called a jurist or jurisconsult (jurisconsultus). A practical jurisconsult (jurisperitus), or a professional lawyer, is one who is skilled in the knowledge of positive external laws, and who can apply them to cases that may occur in experience.