We never really know what stupidity is until we have experimented on ourselves.
Concentrate your strengths against your competitor's relative weaknesses.
Nothing so resembles a daub as a masterpiece.
How do you see those tree?... They are yellow. Well then put down yellow. And that shadow is rather blue. So render it with pure ultramarine. Those red leaves? Use vermillion.
Do you know what will soon be the ultimate in truth?
But I owe something to Vincent, and that is, in the consciousness of having been useful to him, the confirmation of my own original ideas about painting. And also, at difficult moments, the remembrance that one finds others unhappier than oneself.