It is neither necessary nor desirable to attempt the formulation of a single, specific definition of what constitutes the practice of law. Functionally, the practice of law relates to the rendition of services for others that call for the professional judgment of a lawyer. The essence of the professional judgment of the lawyer is his educated ability to relate the general body and philosophy of law to a specific legal problem of a client; and thus, the public interest will be better served if only lawyers are permitted to act in matters involving professional judgment. Where this professional judgment is not involved, non-lawyers, such as court clerks, police officers, abstracters, and many governmental employees, may engage in occupations that require a special knowledge of law in certain areas. But the services of a lawyer are essential in the public interest whenever the exercise of professional legal judgment is required.