Salvation is achieved through the practices and techniques of Scientology, the ultimate goal of which is to realize one's true nature as an immortal spirit, a thetan. The path to salvation, or enlightenment, includes achieving states of increasingly greater mental awareness--Pre-Clear, Clear, and ultimately Operating Thetan. An Operating Thetan is a spirit who can control matter, energy, space, time, thought, and life. Practitioners ("Auditors") are regarded as ministers and counselors who assist others to achieve self-enlightenment. Auditors help others to identify their prebirth, current, and past-life disturbances, which are obstacles to happiness and spiritual enlightenment.