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