“A professional is a man who can do his job when he doesn't feel like it; an amateur is one who can't when he does feel like it.”
Ego, p. 303, September 17, 1933.
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James Agate 9
British diarist and critic 1877–1947Related quotes

“A professional is one who does his best work when he feels the least like working.”

Source: The compleat violinist: thoughts, exercises, reflections of an itinerant violinist http://books.google.co.in/books?id=qC0xAQAAIAAJ, Summit Books, 1 April 1986, p. 79

The Rickover Effect (1992)
Context: When doing a job — any job — one must feel that he owns it, and act as though he will remain in that job forever. He must look after his work just as conscientiously, as though it were his own business and his own money. If he feels he is only a temporary custodian, or that the job is just a stepping stone to a higher position, his actions will not take into account the long-term interests of the organization. His lack of commitment to the present job will be perceived by those who work for him, and they, likewise, will tend not to care. Too many spend their entire working lives looking for the next job. When one feels he owns his present job and acts that way, he need have no concern about his next job.

“The Brave man is not he who does not feel afraid, but he who conquers that fear”
Source: How to Fall in Love

Art Nonsense and Other Essays (1929), published by Cassell; quoted in Eric Gill: Man of Flesh and Spirit by Malcolm Yorke, published by Tauris Parke ISBN 1-86064-584-4, p. 49