What is drawing? How does one learn it? It is working through an invisible iron wall that seems to stand between what one feels and what one can do. How is one to get through that wall -- since pounding against it is of no use? One must undermine the wall and drill through it slowly and patiently, in my opinion. And, look here, how can one continue such a work assiduously without being disturbed or distracted from it -- unless one reflects and regulates one's life according to principles? And it is the same with other things as it is with art.