Why was Paul Cezanne dissatisfied with impressionism?

He believed that a painting is not the free or disembodied play of light and color (impressionism)- on the contrary it is the body. Color is the body as it is perceived by the body. Sensation is in the body and not the air. When we talk about the body we don't necessarily mean the human- even an Apple has a body. So what is painted on the canvas is the body, not insofar as it is represented as an object, but insofar as it is experienced as sustaining a sensation. The sensation of Appleness of an Apple.