Millions of artists create; only a few thousands are discussed or accepted by the spectator and many less again are consecrated by posterity.
In the last analysis, the artist may shout from all the rooftops that he is a genius: he will have to wait for the verdict of the spectator in order that his declarations take a social value and that, finally, posterity includes him in the primers of Artist History.
I know that this statement will not meet with the approval of many artists who refuse this mediumistic role and insist on the validity of their awareness in the creative act— yet, art history has consistently decided upon the virtues of a work of art thorough considerations completely divorced from the rationalized explanations of the artist.
UbuWeb Papers: Marcel Duchamp – The Creative Act (1957).