"Every person who has mastered a profession is a skeptic concerning it"

This quote by George Bernard Shaw suggests that anyone who has achieved proficiency in an occupation is most likely to be skeptical of it. This might be interpreted in a couple of various ways. Firstly, it might imply that those who have actually accomplished a high level of expertise in a specific field are most likely to be more important of their own work and more aware of the potential defects in their own concepts. Secondly, it might indicate that those who have actually attained mastery in an occupation are most likely to be vital of the occupation itself, questioning the accepted standards and conventions of the field. Lastly, it could imply that those who have accomplished proficiency in an occupation are more likely to be doubtful of the concepts and opinions of others in the same field. In any case, this quote suggests that those who have actually achieved proficiency in a profession are most likely to be more vital and analytical of the profession itself.