Don't be afraid of putting on color, refine the work little by little. Don't proceed according to rules and principles, but paint what you observe an… - Camille Pissarro

This morning I received a letter from . He writes that he does not believe scientific research into the nature of color and light can help the artist, neither can anatomy nor the laws of optics. He wants to discuss these questions with me and find out my views. Now everything depends on how this knowledge is to be used. But surely it is clear that we could not pursue our studies of light with much assurance if we did not have as a guide the discoveries of Chevreul and other scientists. I would not have distinguished between local color and light if science had not given us the hint; the same holds true for complementary colors, contrasting colors, etc. 'Yes', he will tell me: 'but these have always been taken into account, look at Monet' It is at this point that the question becomes serious!

The weather is superb except for a very keen wind which causes me to lose much time. - I am doing a portrait of your mother in pastel, it seems it is not adequate as a likeness, it is too old, too red, not fine enough, in short, it won't do. This surprises me not at all. You know that everyone accepts the one I made pretty obvious, but that is not much good either.

Work at the same time upon water, sky, branches, ground, keeping everything going on an equal basis and unceasingly rework until you have got it. Paint generously and unhesitatingly, for it is best not to lose the first impression.