In the interests of public health, safety and welfare, and to protect the people from the unprofessional, improper and incompetent practice of medicine, it is the responsibility of the Legislature to enact laws regulating the granting and subsequent use of the privilege to practice medicine and to ensure, as much as possible, that only qualified and fit persons hold that privilege. The fundamental purpose of this statute is to protect the public, and any license, certificate or other practice authorization issued pursuant to this statute shall be a revocable privilege, and no holder of such a privilege shall acquire thereby any irrevocable right.