I took down my portfolio, to select a drawing to copy in oil. He had never seen my works before, and appeared astonished as his eyes ranged over the sheets. He expressed the warmest admiration, and said, "How hopeless must be the task of my giving any instruction to one who can draw like this?" I pointed out to him that nature is the great study for the artist, and assured him that the reason why my works pleased him was because they are all exact copies of the works of God, — who is the great Architect and perfect Artist; and impressed on his mind this fact, that nature indifferently copied is far superior to the best idealities.

On a meeting with a young artist, Mr. J. B. Kidd, Ch. X, p. 140 - The Life and Adventures of John James Audubon, the Naturalist (1868)