How did rodin's approach to making sculpture show expressive human qualities?

Rodin believed that the attributes of the surface and of the contours of a piece of sculpture could help determine its emotional content and thus its impact on the viewer.  Thus not only his poses but also the way he manipulated the visible surfaces of his bronzes —  the rough, expressive, and light-catching modeling – represented the vitality and emotion of his subject. 

C. gallioli because i remebered it from collage