The expert is the man who stays put.
Professionalism is environmental. Amateurism is anti-environmental. Professionalism merges the individual into patterns of total environment. Amateurism seeks the develop- ment of the total awareness of the individual and the critical awareness of the ground rules of society. The amateur can afford to lose. The professional tends to classify and to specialize, to accept uncritically the ground rules of the environment. The ground rules provided by the mass response of his colleagues serve as a pervasive environment of which he is contentedly unaware. The expert is the man who stays put.
McLuhan in The Medium is the Massage