Authentic work

What is authentic in art? I'm not talking about using microscopes and x-rays to verify a work was made by a particular hand. I am talking about the intentions of the maker. The artist should have the highest intentions for the work. The work should be created with honest intention on making it the best it can be.

Quality is something different. Quality may be pushed to a high degree of finish or worked in a rough manner. Quality can have infinite variation but is tempered with a personal aesthetic using honest intention on making the work the best it can be.

How can anyone possibly expect to judge a works authenticity? Perhaps art is exactly about judging authenticity and quality?