One begins to realize that art... in setting out to express nature with ever growing accuracy, teaches us to look, to perceive, to feel. The stone itself becomes an organic substance, and one can feel it being transformed as one moment in its life succeeds another.
A man who waits to believe in action before acting is anything you like, but he's not a man of action. It is as if a tennis player before returning a ball stopped to think about his views of the physical and mental advantages of tennis. You must act as you breathe.