The greatest artist does not have any concept which a single piece of marble does not itself contain within its excess, though only a hand that obeys the intellect can discover it.
Not once in describing the shape of that mass did I shift my eye from the model. Why? Because I wanted to make sure that nothing evaded my grasp of it. Not a thought about the technical problem of representing it on paper could be allowed to arrest the flow of my feelings about it, from my eye to my hand ... my object is to test to what extent my hands already feel what my eyes see.