—Robert Henri, The Art Spirit (compiled by his 
   student, Margery A. Ryerson), 1923

The old masters
Were not so nervous as we are.

Velasquez:
He must have felt
And willed all that he did.

Corot:
The quality of mind
That makes you paint as you do is what counts.

Manet:
Notice the meaning of every change.
Hogarth: The head of a fish girl.

Here is a sketch by Leonardo da Vinci.
I enter this sketch

And I see him at work and in trouble
And I meet him there.