Robert Henri The Art Spirit
The first time I read this, it was frightening to me. So I went out and started trying to draw and paint from memory. If I was in a cafe, I would start drawing someone and immediately they would move so I would try and finish the drawing from memory. The more I did this, the better I got. When I am on location and I see a figure that I want to put into my painting, instead of taking my camera out, I put my brush down and just try to paint the figure in my head. I then quickly pick up my brush and put it into the painting.