Any fool could paint a tree to look like a flame

"When he saw a tree full of leaves, it existed so much for him that he could not paint it as a tree or give the general impression of a tree with colours (as Monet and the Impressionists did); it explodes into life and looks more like a tree burning with Bengal fires. This is no literary trick (any fool could paint a tree to look like a flame); it is a way of seeing; it is built into his vision, and the proof of its sincerity lies in watching the development of the vision through his painting."

The Mulberry Tree - Van Gogh