" What the world thought made little difference. Rembrandt had to
paint. Whether he painted well or badly didn't matter; painting was the
stuff that held him together as a man. The chief value of art, Vincent, lies
in the expression it gives to the artist. Rembrandt fulfilled what he knew
to be his life purpose; that justified him. Even if his work had been
worthless, he would have been a thousand times more successful than if
he had put down his desire and become the richest merchant in
Amsterdam. (Mendes Da Costa "

― Irving Stone , Lust for Life